Now there was leaning on Jesus' bosom one of his disciples, whom Jesus loved.
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Cornelius a Lapide
AD 1637
There was then reclining on the bosom of Jesus one of His disciples, whom Jesus loved, namely, John himself. The Apostles, desiring to know by name who was to be the traitor, Peter, more eager and fervent than the rest, hints to John , who is reclining on the bosom of Jesus, to inquire of Jesus, as John here relates, and this is the force of the "then." John being dearer to Jesus and closer to Him, inasmuch as he was reclining on His bosom, therefore, for this reason, Peter hints to him to inquire of Jesus his beloved the name of the traitor. Moreover, John is said to have reclined on the bosom of Jesus because the ancients used not to sit at table, but reclined by twos or threes on the several couches placed before the tables, so that, leaning on the lower part of the right arm, they lay rather than sat at table; and so it came to pass that the second person coming next to the first on his left hand would seem as it were to lie upon his bosom.
Whom Jesus loved—not only with the love ...
One of his disciples. St. John himself was lying at table in (or towards) the bosom of Jesus. These words seem to express the manner that the Jews were placed at table. They had couches about a table, to lean or lie upon; and three for example upon each couch. The master, or head of the company, was placed in the midst; so that we may suppose, that Christ was placed on one of these couches in the midst, St. Peter on one side of him, and St. John on the other; and that St. John, in that resting and leaning posture, had his head all the time turned, and inclined towards Christ's bosom: yet it can scarce be imagined, that his head laid continually upon our Saviour's breast or bosom; for this posture would have been very uneasy to Jesus, or to any one. St. John then leaned all supper time towards Jesus's bosom or breast, but not upon it. (Witham)
Whilst all were fearing for themselves, and Peter, the very head of the apostles, was trembling, St. John rests; reposing on the bosom of Jesus....