Now there was leaning on Jesus' bosom one of his disciples, whom Jesus loved.

Now there was at table one of his disciples in the bosom of Jesus, whom Jesus loved.

And there was one of his disciples reclining (at meat) in the bosom of Jesus, whom Jesus was loving;

There was at table one of His disciples - the one Jesus loved - reclining with his head on Jesus's bosom.

There was at table one of his disciples, the one dear to Jesus, resting his head on Jesus' breast.

One of his disciples, whom Jesus loved, was reclining against Jesus' chest.

Next to Jesus, in the place on his right hand, was one of his disciples, whom he loved.

Whom Jesus loved. The peculiar love with which Christ loved John plainly testifies that, if we love some more than others, this is not always inconsistent with brotherly love; but all lies in this, that our love shall be directed towards God, and that every man, in proportion as he excels in the gifts of God, shall share in it the more largely. From this end Christ never turned aside in the smallest degree; but with us the case is widely different, for such is the vanity of our mind, that there are few who, in loving men, approach more nearly to God. And yet the love of men towards each other will never be properly regulated, unless it be directed to God. Lay at table in Jesus' bosom. What is here related by John might be regarded in the present day as indecorous; but such was, at that time, the manner of being placed at table; for they did not sit, as we do, at table, but, after having put off their shoes, lay half-stretched out, reclining on small cushions.

Leaning on Jesus' bosom - This does not mean that he was at that time actually lying on his bosom, but that he occupied a situation next to him at the table, so that his head naturally fell back on his bosom when he spoke to him. See the notes at Matthew 23:6.
Whom Jesus loved - This was doubtless John himself. The evangelists are not accustomed to mention their own names when any mark of favor or any good deed is recorded. They did not seek publicity or notoriety. In this case the appellation is more tender and honorable than any mere name. John was admitted to special friendship, perhaps, because the natural disposition of our Saviour was more nearly like the amiableness and mildness of John than any of the other disciples (Robert Hall). The highest honor that can be conferred on any man is to say that Jesus loved him. Yet this is an honor which all may possess, but which none can inherit without his spirit and without loving him. It is an honor which cannot be won by wealth or learning, by beauty or accomplishments, by rank or earthly honors, but only by the possession of a meek and quiet spirit, which is in the sight of God of great price, 1-Peter 3:4; compare Romans 8:9.

Now there was leaning on Jesus' bosom - The Jews of those days, at their suppers, reclined, supported by their left arm, on couches placed round the table, as the Greeks and Romans did. On each couch there were two or three persons; and the head of one of them came near to the bosom of him who reclined above him on the same couch. The person here mentioned was John, the writer of this history, who, being more tenderly loved by Christ than the rest, had always that place at table which was nearest to his Lord.

Now there was (f) leaning on Jesus' bosom one of his disciples, whom Jesus loved.
(f) John's leaning was such that sitting down on his mat his head was toward the head of Jesus: for it is certain that in ancient times men used to not sit at the table, but to lie down on one of their sides.

Now there was leaning on Jesus' bosom,.... Not pressing upon that part of Christ's body, which would have been irreverent in John, and troublesome to Christ; but leaning at table upon his bed or couch, on which he lay; and which was next to, and just before Christ; so that he was very near unto, and seemed to lie in the bosom of Christ; as such are said to do, who sit next at table to another. The posture of the Jews at table, was either "sitting" or "lying", and a difference they make between these two;
"if, say they (d), , "they sat" to eat everyone asked a blessing for himself; but if "they lay down", one asked a blessing for them all.''
This lying down was not on their backs, nor on their right side, but on their left; for they say (e), that
"lying down on the back, is not called "lying down"; and lying on the right side, is not called lying down.''
And the reason given is (f), because they have need of the right hand to eat with; but as they elsewhere (g) observe,
"they used to eat lying along, leaning on the left side, their feet to the ground, and every man on a single couch.''
Would you know the order in which they, lay, take the account as they have given it (h);
"when there were but two couches, the principal person lay first, and the second to him above him; and when there were three, the principal person lay in the middle, the second to him above him, and the third below him; and if he would talk with him, he raised himself upright, and sitting upright he talked with him; that is, as the gloss explains it, if the principal person was desirous to talk with him that was second to him, he must raise himself up from his lying down, and sit upright; for all the white he is leaning, he cannot talk with him, because he that is second to him, is behind the head of the principal person, and the face of the principal person is turned to the other side; and it is better for the second to sit below him, that he may hear his words, whilst he is leaning.''
The form in which Christ and his disciples sat or lay at table, we may conceive was this (i); a table was placed in the middle and as many beds or couches round it, as there were persons; Christ the principal and most worthy person lay first, with his head toward the table, his face somewhat turned from it, leaning on his left elbow upon the couch; in this posture lay Jesus, upon the first couch; in the same posture lay John, in the next to him, and just before him; the hinder part of his head being towards, and near the breast and bosom of Jesus; whence he is said to lean upon it: now to lie next to the principal person, was a very great honour, as well as a mark of great affection; and for John to lie next to Jesus, and as it were to lean on his bosom, showed how much he was respected and honoured by him; and therefore John modestly conceals his name, and only says,
one of his disciples whom Jesus loved; Christ, as the Son of God, and surety of his people, loved his true disciples, as he does all his elect, alike; not one more than the other; but as man, he had a particular affection for this disciple, and therefore admitted him near his person, and was very familiar with him.
(d) Misn. Beracot, c. 6. sect. 6. (e) T. Bab. Pesachim, fol. 108. 1. (f) Gloss in ib. (g) Gloss in T. Bab. Beracot, fol. 46. 2. & Bartenora in Misn. Beracot, c. 6. sect. 6. (h) T. Bab. Beracot, fol. 46. 2. (i) Vid. Alstorphium delectis veterum, p. 109, 110.

there was leaning on Jesus' bosom one of his disciples, whom Jesus loved--Thus modestly does our Evangelist denote himself, as reclining next to Jesus at the table.
Peter . . . beckoned to him to ask who it should be of whom he spake--reclining probably at the corresponding place on the other side of Jesus.

There was lying in the bosom of Jesus - That is, sitting next to him at table. This phrase only expresses the then customary posture at meals, where the guests all leaned sidewise on couches. And each was said to lie in the bosom of him who was placed next above him. One of the disciples whom Jesus loved - St. John avoids with great care the expressly naming himself. Perhaps our Lord now gave him the first proof of his peculiar love, by disclosing this secret to him.