And they continued stedfastly in the apostles' doctrine and fellowship, and in breaking of bread, and in prayers.

And they continued stedfastly in the apostles teaching and fellowship, in the breaking of bread and the prayers.

And they were persevering in the doctrine of the apostles, and in the communication of the breaking of bread, and in prayers.

And they persevered in the teaching and fellowship of the apostles, in breaking of bread and prayers.

And they continued steadfastly in the apostles doctrine and fellowship, and in breaking of bread, and in prayers.

and they were continuing stedfastly in the teaching of the apostles, and the fellowship, and the breaking of the bread, and the prayers.

and they were constant in listening to the teaching of the Apostles and in their attendance at the Communion, that is, the Breaking of the Bread, and at prayer.

And they kept their attention fixed on the Apostles' teaching and were united together in the taking of broken bread and in prayer.

They devoted themselves to the teaching of the apostles and to the Common life of the church, to the breaking of the bread and to the Prayers.

In their doctrine Luke doth not only commend in them the constancy of faith or of godliness, but he saith, also, that they did constantly give themselves to those exercises which serve to the confirmation of faith; to wit, that they studied continually to profit by hearing the apostles; that they gave themselves much to prayer; that they did use fellowship and breaking of bread very much. As touching prayer and doctrine the sense is plain. Communication or fellowship, and breaking of bread, may be taken diversely. Some think that breaking of bread doth signify the Lord's Supper; other some do think that it signifieth alms; other some that the faithful did banquet together [1] among themselves. Some do think that koinonia, doth signify the celebrating of the Holy Supper; but I do rather agree to those others who think that the same is meant by the breaking of bread. For koinonia, unless it have somewhat added unto it, is never found in this sense; therefore, I do rather refer it unto mutual society and fellowship, unto alms, and unto other duties of brotherly fellowship. And my reason why I would rather have breaking of bread to be understood of the Lord's Supper in this place is this, because Luke doth reckon up those things wherein the public estate of the Church is contained. Yea, he expresseth in this place four marks whereby the true and natural face of the Church may be judged. Do we then seek the true Church of Christ? The image thereof is lively depainted and set forth [2] unto us in this place. And he beginneth with doctrine which is, as it were, the soul of the Church. Neither doth he name all manner of doctrine, but the doctrine of the apostles, that is, that which the Son of God had delivered by their hands. Therefore, wheresoever the pure voice of the gospel doth sound, where men continue in the profession thereof, where they exercise themselves in hearing the same ordinarily that they may profit, without all doubt there is the Church. Hereby we may easily gather how frivolous the boasting of the Papists is, whilst that they carelessly [3] thunder out with fall mouth the name of the Church; whereas, notwithstanding, they have most filthily corrupted the doctrine of the apostles. For if it be duly examined, we shall find no sound part at all; and in most points they do as much dissent from the same, and have as little agreement therewith as light with darkness. The rule of worshipping God, which ought to be fetched out of the pure Word of God alone, is only made and patched together [4] amongst the Papists, of the superstitious inventions of men. They have translated unto the merits of works the hope of salvation, which ought to have rested in Christ alone. The invocation of God is altogether polluted with innumerable profane dotings of men. Finally, whatsoever is heard amongst them, it is either a deforming of the apostles' doctrine, or else a clear overthrowing (and destroying) of the same. Therefore, we may as easily refute the foolish arrogancy of the Papists, as they can cloak their dealings with the title of the Church. For this shall be the state, [5] whether they have retained the purity of doctrine, from which they are as far as hell is from heaven. But they are wise enough in that point, because they will have no controversy moved about doctrine. But we, as I have said, may freely contemn that vain visor, [mask,] forasmuch as the Spirit of God doth pronounce that the Church is principally to be (esteemed and) discerned by this mark, if the simplicity or purity of the doctrine delivered by the apostles do flourish (and be of force) in the same. In fellowship. This member and the last do flow from the first, as fruits or effects. For doctrine is the bond of brotherly fellowship amongst us, and doth also set open unto us the gate unto God, that we may call upon him. And the Supper is added unto doctrine instead of a confirmation. Wherefore, Luke doth not in vain reckon up these four things, when as he will describe unto us the well-ordered state of the Church. And we must endeavor to keep and observe this order, if we will be truly judged to be the Church before God and the angels, and not only to make boast of the name [6] thereof amongst men. It is certain that he speaketh of public prayer. And for this cause it is not sufficient for men to make their prayers at home by themselves, unless they meet altogether to pray; wherein consisteth also the profession of faith.

Footnotes

1 - "Communiter," in common.

2 - "Ad vivum depicta," painted to the life.

3 - "Secure," confidently.

4 - "Conflata est," compounded.

5 - "Hic enim erit status," for the state (of the question) shall be.

6 - "Inane...nomen," the empty name.

And they continued stedfastly - They persevered in, or they adhered to. This is the inspired record of the result. That any of these apostatized is nowhere recorded, and is not to be presumed. Though they had been suddenly converted; though they were suddenly admitted to the church; though they were exposed to much persecution and contempt, and to many trials, yet the record is that they adhered to the doctrines and duties of the Christian religion. The word rendered "continued stedfastly" - προσκαρτεροῦντες proskarterountes - means "attending one, remaining by his side, not leaving or forsaking him."
The apostles' doctrine - This does not mean that they held or believed the doctrines of the apostles, though that was true; but it means that they adhered to, or attended on, their teaching or instruction. The word doctrine has now a technical sense, and means a collection and arrangement of abstract views supposed to be contained in the Bible. In the Scriptures the word means simply "teaching"; and the expression here denotes that they continued to attend on their instructions. One evidence of conversion is a desire to be instructed in the doctrines and duties of religion, and a willingness to attend on the preaching of the gospel.
And fellowship - The word rendered "fellowship," κοινωνία koinōnia, is often rendered "communion." It properly denotes "having things in common, or participation, society, friendship." It may apply to anything which may be possessed in common, or in which all may partake. Thus, all Christians have the same hope of heaven; the same joys; the same hatred of sin; the same enemies to contend with. Thus, they have the same subjects of conversation, of feeling, and of prayer; or they have communion in these things. And thus the early Christians had their property in common. The word here may apply to either or to all of these things to their conversation, their prayers, their dangers, or their property; and means that they were united to the apostles, and participated with them in whatever befell them. It may be added that the effect of a revival of religion is to unite Christians more and more, and to bring those who were before separated to union and love. Christians feel that they are a band of brethren, and that, however much they were separated before they became Christians, now they have great and important interests in common; they are united in feelings, in interests, in dangers, in conflicts, in opinions, and in the hopes of a blessed immortality.
Breaking of bread - The Syriac renders this "the eucharist" or the Lord's Supper. It cannot, however, be determined whether this refers to their partaking of their ordinary food together, or to feasts of charity, or to the Lord's Supper. The bread of the Hebrews was made commonly into cakes, thin, hard, and brittle, so that it was broken instead of being cut. Hence, to denote "intimacy or friendship," the phrase "to break bread together" would be very expressive in the same way as the Greeks denoted it by drinking together, συμπόσιον sumposion. From the expression used in Acts 2:44, compare with Acts 2:46, that they had all things common, it would rather seem to be implied that this referred to the participation of their ordinary meals. The action of breaking bread was commonly performed by the master or head of a family immediately after asking a blessing (Lightfoot).
In prayers - This was one effect of the influence of the Spirit, and an evidence of their change. A genuine revival will be always followed by a love of prayer.

They continued steadfastly in the apostles' doctrine - They received it, retained it, and acted on its principles.
And fellowship - Κοινωνιᾳ, community; meaning association for religious and spiritual purposes, The community of goods cannot be meant; for this is mentioned Acts 2:44, Acts 2:45, where it is said, they had all things common.
And in breaking of bread - Whether this means the holy eucharist, or their common meals, it is difficult to say. The Syriac understands it of the former. Breaking of bread was that act which preceded a feast or meal, and which was performed by the master of the house, when he pronounced the blessing - what we would call grace before meat. See the form on Matthew 26:26 (note).
And in prayers - In supplications to God for an increase of grace and life in their own souls; for establishment in the truth which they had received, and for the extension of the kingdom of Christ in the salvation of men. Behold the employment of the primitive and apostolic Church.
1. They were builded up on the foundation of the prophets and apostles, Jesus Christ himself being the corner stone.
2. They continued steadfastly in that doctrine which they had so evidently received from God.
3. They were separated from the world, and lived in a holy Christian fellowship, strengthening and building up each other in their most holy faith.
4. They were frequent in breaking bread; in remembrance that Jesus Christ died for them.
5. They continued in prayers; knowing that they could be no longer faithful than while they were upheld by their God; and knowing also that they could not expect his grace to support them, unless they humbly and earnestly prayed for its continuance.

(11) And they continued stedfastly in the apostles' doctrine and (b) fellowship, and in (c) breaking of bread, and in prayers.
(11) The marks of the true Church are the doctrine of the apostles, the duties of charity, the pure and simple administration of the ordinances, and the true invocation used by all of the faithful.
(b) Sharing of goods, and all other duties of charity, as is shown afterwards.
(c) The Jews used thin loaves, and therefore they broke them rather than cut them: so by breaking of bread they meant living together, and the banquets which they used to keep. And when they kept their love feasts, they used to celebrate the Lord's supper, which even in those days began to be corrupted, and Paul corrects this in (1Co. 11:17-34).

And they continued steadfastly in the apostles' doctrine,.... And which is the same with the doctrine of Christ, of which he is the author, preacher, and subject; the substance of which is peace, pardon, righteousness, and salvation by him: this the apostles received from Christ, and constantly taught in their ministry; for which reason, it is called theirs; and this these young converts had embraced gladly; and were not only believers of it, but persevering believers; they were constant hearers of it; they continually attended on the ministry of the apostles, and held fast the form of sound words they had received from them; and stood fast in the faith of the Gospel, notwithstanding all the reproach cast upon it, and the afflictions they endured for it:
and fellowship; with the apostles and other saints, in spiritual conversation with them, in private, and in communion with them at the Lord's table in public: and so the Vulgate Latin reads this clause, in connection with the next, thus, "in the communication of breaking of bread"; to which agrees the Syriac version, and "they communicated in prayer, and in breaking of the eucharist"; though it seems better to understand this of a distinct branch of fellowship, or communication, and may rather intend liberality and beneficence, in which sense it is used, Romans 15:26 and so expresses their constant contributions towards the support of the apostles, as ministers of the word and of the poor members of the church; a duty which, in both its branches, is incumbent on those who have it in their power to perform, and which these first Christians were remarkable for:
and in breaking of bread; or "of the eucharist": as the Syriac version renders it, which was an usual name with the ancients for the Lord's supper; and which seems to be intended here, and not eating common bread, or a common meal; seeing it is here mentioned with religious exercises: and though the Jews used to begin their meals with breaking of bread, yet the whole repast, or meal, is never by them called by that name; and for what reason these saints should be commended for keeping their common meals, cannot be said, unless to show their sociableness, agreement, and brotherly love in eating together; and which is not hinted at here, but in Acts 2:46 where it is mentioned as something distinct from this: it seems rather therefore to design, that they were constant at the Lord's table, kept their places there, and duly attended whenever the ordinance was administered:
and in prayers: not only in their closets, and in their families, but in the church; in the public prayers of the church, they observed all opportunities of this kind, and gladly embraced them.

In these verses we have the history of the truly primitive church, of the first days of it; its state of infancy indeed, but, like that, the state of its greatest innocence. They kept close to holy ordinances, and abounded in piety and devotion; for Christianity, when admitted in the power of it, will dispose the soul to communion with God in all those ways wherein he has appointed us to meet him, and has promised to meet us. The greatness of the event raised them above the world, and the Holy Ghost filled them with such love, as made every one to be to another as to himself, and so made all things common, not by destroying property, but doing away selfishness, and causing charity. And God who moved them to it, knew that they were quickly to be driven from their possessions in Judea. The Lord, from day to day, inclined the hearts of more to embrace the gospel; not merely professors, but such as were actually brought into a state of acceptance with God, being made partakers of regenerating grace. Those whom God has designed for eternal salvation, shall be effectually brought to Christ, till the earth is filled with the knowledge of his glory.

continued steadfastly in--"attended constantly upon."
the apostles' doctrine--"teaching"; giving themselves up to the instructions which, in their raw state, would be indispensable to the consolidation of the immense multitude suddenly admitted to visible discipleship.
fellowship--in its largest sense.
breaking of bread--not certainly in the Lord's Supper alone, but rather in frugal repasts taken together, with which the Lord's Supper was probably conjoined until abuses and persecution led to the discontinuance of the common meal.
prayers--probably, stated seasons of it.

They continued stedfastly in the apostles' doctrine. In the things taught by the apostles.
And fellowship. Contribution to the common fund and its distribution.
The breaking of bread. The Lord's supper. From this time it is observed as an ordinance of the church.
In prayers. I think the prayers of the regular worship are meant. These four items are all features of the public church life.

And they continued steadfast - So their daily Church communion consisted in these four particulars: Hearing the word; Having all things common; Receiving the Lord's Supper; Prayer.
Ye diff'rent sects, who all declare, Lo here is Christ, and Christ is there; Your stronger proofs divinely give, And show me where the Christians live!