Theophylact of Ohrid
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.
The Father having given up all things into His hands, i. e. having given up to Him the salvation of the faithful, He deemed it right to shew them all things that pertained to their salvation; and gave them a lesson of humility, by washing His disciples’ feet. Though knowing that He was from God, and went to God, He thought it in no way took from His glory, to wash His disciples’ feet; thus proving that He did not usurp His greatness. For usurpers do not condescend, for fear of losing what they have irregularly got.