en_tn/jhn/13/23.md

One of his disciples, whom Jesus loved

This refers to John.

lying down at the table

During the time of Christ, Jews would often dine together in the Greek style, in which they lay on their sides on low couches. (See: rc://en/ta/man/jit/figs-explicit)

Jesus's side

Lying with one's head against the side of another diner in the Greek style was considered to be the place of greatest friendship with him.

loved

The kind of love that comes from God is focused on having good things happen to others even when those good things do not happen to the one who loves.