And I saw in the right hand of him that sat on the throne - Of God, Revelation 4:3-4. His form is not described there, nor is there any intimation of it here except the mention of his." right hand." The book or roll seems to have been so held in his hand that John could see its shape, and see distinctly how it was written and sealed.
A book - βιβλίον biblion This word is properly a diminutive of the word commonly rendered "book" (βίβλος biblos), and would strictly mean a small book, or a book of diminutive size - a tablet, or a letter (Liddell and Scott, Lexicon). It is used, however, to denote a book of any size - a roll, scroll, or volume; and is thus used:
(a) to denote the Pentateuch, or the Mosaic law, Hebrews 9:19; Hebrews 10:7;
(b) the book of life, Revelation 17:8; Revelation 20:12; Revelation 21:27;
(c) epistles which were also rolled up, Revelation 1:11;
(d) documents, as a bill of divorce, Matthew 19:7; Mark 10:4.
When it is the express design to speak of a small book, another word is used (βιβλαρίδιον biblaridion), Revelation 10:2, Revelation 10:8-10. The book or roll referred to here was what contained the revelation in the subsequent chapters, to the end of the description of the opening of the seventh seal - for the communication that was to be made was all included in the seven seals; and to conceive of the size of the book, therefore, we are only to reflect on the amount of parchment that would naturally be written over by the communications here made. The form of the book was undoubtedly that of a scroll or roll; for that was the usual form of books among the ancients, and such a volume could be more easily sealed with a number of seals, in the manner here described, than a volume in the form in which books are made now. On the ancient form of books, see the notes on Luke 4:17. The engraving in Job 19, will furnish an additional illustration of their form.
Written within and on the back side - Greek, "within and behind." It was customary to write only on one side of the paper or vellum, for the sake of convenience in reading the volume as it was unrolled. If, as sometimes was the case, the book was in the same form as books are now - of leaves bound together - then it was usual to write on beth sides of the leaf, as both sides of a page are printed now. But in the other form it was a very uncommon thing to write on both sides of the parchment, and was never done unless there was a scarcity of writing material; or unless there was an amount of matter beyond what was anticipated; or unless something had been omitted. It is not necessary to suppose that John saw both sides of the parchment as it was held in the hand of him that sat on the throne. That it was written on the back side he would naturally see, and, as the book was sealed, he would infer that it was written in the usual manner on the inside.
Sealed with seven seals - On the ancient manner of sealing, see the notes on Matthew 27:66; compare the notes on Job 38:14. The fact that there were seven seals - an unusual number in fastening a volume - would naturally attract the attention of John, though it might not occur to him at once that there was anything significant in the number. It is not stated in what manner the seals were attached to the volume, but it is clear that they were so attached that each seal closed one part of the volume, and that when one was broken and the portion which that was designed to fasten was unrolled, a second would be come to, which it would be necessary to break in order to read the next portion. The outer seal would indeed bind the whole; but when that was broken it would not give access to the whole volume unless each successive seal were broken. May it not have been intended by this arrangement to suggest the idea that the whole future is unknown to us, and that the disclosure of any one portion, though necessary if the whole would be known, does not disclose all, but leaves seal after seal still unbroken, and that they are all to be broken one after another if we would know all? How these were arranged, John does not say. All that is necessary to be supposed is, that the seven seals were put successively upon the margin of the volume as it was rolled up, so that each opening would extend only as far as the next seal, when the unrolling would be arrested. Anyone, by rolling up a sheet of paper, could so fasten it with pins, or with a succession of seals, as to represent this with sufficient accuracy.

A book written within and on the back side - That is, the book was full of solemn contents within, but it was sealed; and on the back side was a superscription indicating its contents. It was a labelled book, or one written on each side of the skin, which was not usual.
Sealed with seven seals - As seven is a number of perfection, it may mean that the book was so sealed that the seals could neither be counterfeited nor broken; i.e., the matter of the book was so obscure and enigmatical and the work it enjoined and the facts it predicted so difficult and stupendous, that they could neither be known nor performed by human wisdom or power.

And (1) I saw in the (2) right hand of him that sat on the throne (3) a book written within and on the backside, sealed with seven seals.
(1) A passing to the second principal cause, which is the Son of God, God and man, the mediator of all, as the eternal word of God the Father, manifest in the flesh. This chapter has two parts: one that prepares the way to the revelation, by rehearsal of the occasions that occurred in the first four verses (Revelation 5:2-5). Another, the history of the revelation of Christ, from there to the end of the chapter (Revelation 5:6-14). (2) That is, in the very right hand of God. (3) Here are shown the occasions for which the principal cause, and this revelation was also necessary: the same are three, the first a present vision of the book of the counsels of God, concerning the government of this whole world, which book is said to be laid up with the Father as it were in his hand: but shut up and unknown to all creature, in this verse. The second is a religious desire of the angels of God to understand the mysteries of this book (1-Peter 1:12) (Revelation 5:2). The third is a lamentation of John and all the godly, moved by the same desire (Revelation 5:4) when they saw that it was an impossible thing for any creature to do: which is declared in (Revelation 5:3).

And I saw on the right hand of him that sat on the throne,.... Of this throne, and who it was that sat upon it; see Gill on Revelation 4:2; and who had "in" his right hand, or "at", or "upon" his right hand, as the Syriac and Arabic versions render it, lying by, or near his right hand; though according to Revelation 5:7, the book appears to have been in his right hand, as our version, and others render it:
a book written within, and on the backside, sealed with seven seals: this book was very much like Ezekiel's roll, Ezekiel 2:9; which was written , "within" and "without", before and behind, and indeed it was in the form of a roll: the manner of writings in those times was on sheets of parchment, which, when finished, were rolled up in the form of a cylinder; hence a book is called a "volume". This book seems to have consisted of seven rolls, to which was annexed seven seals; and there being not room enough within, contrary to the common way of writing, some things were written upon the backside of the outermost roll; and such writings were by the ancients called "Opistographi": and the word is used by them sometimes for very prolix writings (b). By this book some understand the Scriptures of the Old Testament, which were written in rolls; see Hebrews 10:5; and which came out of the right hand of God, and were given forth by him; and being written within, and on the backside, may denote the fulness of them, they containing a variety of matter, useful and profitable, for different purposes; or else the literal and mystical, or spiritual meaning of some parts of them: or, as others think, the more clear explanation of the books of the Old Testament, by those of the New Testament; and its being sealed may signify the authenticity of those writings, having the seal of God's truth, and the impress of his wisdom, power, and goodness on them; and also the hidden sense and meaning of them, they being, especially in the prophetic and spiritual part of them, a sealed book to natural men, and of which Christ is the truest and best interpreter; but then this book was opened, and looked into, and read, and, in some measure, understood, even by the Old Testament saints, and had been before this time expounded by Christ, concerning himself; yea, he had opened the understandings of his disciples to understand those Scriptures, and had counted them, and others, worthy to open and explain this book to others, and had sent them into all the world for this purpose; and for the same reasons it cannot be understood of the Gospel published to Jews and Gentiles, the one within, and the other without; rather therefore the book of God's decrees is here meant, which respects all creatures, and all occurrences and events in the whole world, from the beginning to the end of time; and so Ezekiel's roll, according to the Targum on Ezekiel 2:10; which was written before and behind, signified that which was , "from the beginning", and which , "shall be in the end", or hereafter. This book God holds "in his right hand", as the rule and measure of all he does, and of the government of the world, and which he constantly fulfils and executes; and its being written "within and without" may denote the perfection and comprehensiveness of it, it reaching to all creatures and things, even the most minute; and its being "sealed" shows the certainty of its fulfilment, and the secrecy and hiddenness of it, until accomplished; though it seems best of all to understand it of that part of God's decrees relating to the church and world, particularly the Roman empire, which from henceforward, to the end of time, was to be fulfilled; and so is no other than the book of the Revelation itself, exhibited in the following scenes and visions; and this may be truly said to be in the right hand of God, and from thence taken by the Lamb, it being the revelation of Jesus Christ, which God gave unto him, Revelation 1:1; and may be said to be written, both "within and on the backside", to show that it contains a large account of things, a long train of events to be accomplished; as also to signify, that it regards the church, and the members of it, who are those that are within, in the several ages of time, and the world, or those that are without; for this book prophecy regards both the state of the Roman empire, and of the Christian church; and its being "sealed" shows the authenticity, certainty, and also the obscurity of what was contained therein; and with "seven" seals, with respect to the seven periods of time, in which the prophecies in it are to be fulfilled.
(b) Vid. Alex. ab Alex. Genial. Dier. l. 2. c. 30. & Salmuth in Panciroll. rer. Memorab. par. 1. tit. 42. p. 145.

The apostle saw in the hand of Him that sat upon the throne, a roll of parchments in the form usual in those times, and sealed with seven seals. This represented the secret purposes of God about to be revealed. The designs and methods of Divine Providence, toward the church and the world, are stated, fixed, and made a matter of record. The counsels of God are altogether hidden from the eye and understanding of the creature. The several parts are not unsealed and opened at once, but after each other, till the whole mystery of God's counsel and conduct is finished in the world. The creatures cannot open it, nor read it; the Lord only can do so. Those who see most of God, are most desirous to see more; and those who have seen his glory, desire to know his will. But even good men may be too eager and hasty to look into the mysteries of the Divine conduct. Such desires, if not soon answered, turn to grief and sorrow. If John wept much because he could not look into the book of God's decrees, what reason have many to shed floods of tears for their ignorance of the gospel of Christ! of that on which everlasting salvation depends! We need not weep that we cannot foresee future events respecting ourselves in this world; the eager expectation of future prospects, or the foresight of future calamities, would alike unfit us for present duties and conflicts, or render our prosperous days distressing. Yet we may desire to learn, from the promises and prophecies of Scripture, what will be the final event to believers and to the church; and the Incarnate Son has prevailed, that we should learn all that we need to know. Christ stands as Mediator between God and both ministers and people. He is called a Lion, but he appears as a Lamb slain. He appears with the marks of his sufferings, to show that he pleads for us in heaven, in virtue of his satisfaction. He appears as a Lamb, having seven horns and seven eyes; perfect power to execute all the will of God, and perfect wisdom to understand it, and to do it in the most effectual manner. The Father put the book of his eternal counsels into the hand of Christ, and Christ readily and gladly took it into his hand; for he delights to make known the will of his Father; and the Holy Spirit is given by him to reveal the truth and will of God.

THE BOOK WITH SEVEN SEALS: NONE WORTHY TO OPEN IT BUT THE LAMB: HE TAKES IT AMIDST THE PRAISES OF THE REDEEMED, AND OF THE WHOLE HEAVENLY HOST. (Revelation 5:1-14)
in, &c.--Greek, "(lying) upon the right hand." His right hand was open and on it lay the book. On God's part there was no withholding of His future purposes as contained in the book: the only obstacle to unsealing it is stated in Revelation 5:3 [ALFORD].
book--rather, as accords with the ancient form of books, and with the writing on the backside, "a roll." The writing on the back implies fulness and completeness, so that nothing more needs to be added (Revelation 22:18). The roll, or book, appears from the context to be "the title-deed of man's inheritance" [DE BURGH] redeemed by Christ, and contains the successive steps by which He shall recover it from its usurper and obtain actual possession of the kingdom already "purchased" for Himself and His elect saints. However, no portion of the roll is said to be unfolded and read; but simply the seals are successively opened, giving final access to its contents being read as a perfect whole, which shall not be until the events symbolized by the seals shall have been past, when Ephesians 3:10 shall receive its complete accomplishment, and the Lamb shall reveal God's providential plans in redemption in all their manifold beauties. Thus the opening of the seals will mean the successive steps by which God in Christ clears the way for the final opening and reading of the book at the visible setting up of the kingdom of Christ. Compare, at the grand consummation, Revelation 20:12, "Another book was opened . . . the book of life"; Revelation 22:19. None is worthy to do so save the Lamb, for He alone as such has redeemed man's forfeited inheritance, of which the book is the title-deed. The question (Revelation 5:2) is not (as commonly supposed), Who should reveal the destinies of the Church (for this any inspired prophet would be competent to do)? but, Who has the WORTH to give man a new title to his lost inheritance? [DE BURGH].
sealed . . . seven seals--Greek, "sealed up," or "firmly sealed." The number seven (divided into four, the world-wide number, and three, the divine) abounds in Revelation and expresses completeness. Thus, the seven seals, representing all power given to the Lamb; the seven trumpets, by which the world kingdoms are shaken and overthrown, and the Lamb's kingdom ushered in; and the seven vials, by which the beast's kingdom is destroyed.

And I saw in the right hand of him that sat on the throne a book. The book is in the right hand of God. It is not a printed book, such as we have one our shelves. There were no printed books then in existence. It is a manuscript, written upon both sides, and rolled together in the form of a scroll, and sealed with seven seals. We learn, what is recorded in the next chapter, that these seals were so arranged that when they were loosened in succession each one permitted a part of the book to be read. Possibly there were seven leaves to the book, since as each seal was loosed, a leaf of the book was revealed. The parchment was written on each side; the book was full, complete, nothing more to be added to what it contained. This sealed book is the book of the future, sealed to human vision, unknown even to the angels of heaven, and containing the record of "what shall be hereafter," to the end of time.

And I saw - This is a continuation of the same narrative. In the right hand - The emblem of his all - ruling power. He held it openly, in order to give it to him that was worthy. It is scarce needful to observe, that there is not in heaven any real book of parchment or paper or that Christ does not really stand there, in the shape of a lion or of a lamb. Neither is there on earth any monstrous beast with seven heads and ten horns. But as there is upon earth something which, in its kind, answers such a representation; so there are in heaven divine counsels and transactions answerable to these figurative expressions. All this was represented to St. John at Patmos, in one day, by way of vision. But the accomplishment of it extends from that time throughout all ages. Writings serve to inform us of distant and of future things. And hence things which are yet to come are figuratively said to be "written in God's book;" so were at that time the contents of this weighty prophecy. But the book was sealed. Now comes the opening and accomplishing also of the great things that are, as it were, the letters of it. A book written within and without - That is, no part of it blank, full of matter. Sealed with seven seals - According to the seven principal parts contained in it, one on the outside of each. The usual books of the ancients were not like ours, but were volumes or long pieces of parchment, rolled upon a long stick, as we frequently roll silks. Such was this represented, which was sealed with seven seals. Not as if the apostle saw all the seals at once; for there were seven volumes wrapped up one within another, each of which was sealed: so that upon opening and unrolling the first, the second appeared to be sealed up till that was opened, and so on to the seventh. The book and its seals represent all power in heaven and earth given to Christ. A copy of this book is contained in the following chapters. By "the trumpets," contained under the seventh seal, the kingdom of the world is shaken, that it may at length become the kingdom of Christ. By "the vials," under the seventh trumpet, the power of the beast, and whatsoever is connected with it, is broken. This sum of all we should have continually before our eyes: so the whole Revelation flows in its natural order.