John Chrysostom
Catena Aurea · Johannesevangelium 13
Now before the feast of the passover, when Jesus knew that his hour was come that he should depart out of this world unto the Father, having loved his own which were in the world, he loved them unto the end. And supper being ended, the devil having now put into the heart of Judas Iscariot, Simon’s son, to betray him; Jesus knowing that the Father had given all things into his hands, and that he was come from God, and went to God; He riseth from supper, and laid aside his garments; and took a towel, and girded himself. After that he poureth water into a bason, and began to wash the disciples’ feet, and to wipe them with the towel wherewith he was girded.
(Hom. lxx. 1) The Evangelist inserts this as if in astonishment: our Lord being about to wash the feet of the very person who had resolved to betray Him. It shews the great wickedness too of the traitor, that even the partaking of the same table, which is a check to the worst of men, did not stop him.