John the Apostle
John 13:12ESV·traditional attribution

When he had washed their feet and put on his outer garments and resumed his place, he said to them, “Do you understand what I have done to you?

John Calvin Reformed @genevareformer

12. When then he had washed their feet. Christ at length explains what was his intention in washing the feet of his disciples; for what he had said about the spiritual washing was a sort of digression from his main design. Had it not been for the opposition made by Peter, Christ would not have spoken on that subject.

Matthew Henry Presbyterian @wholebiblehenry

It has generally been taken for granted by commentators that Christ's washing his disciples' feet, and the discourse that followed it, were the same night in which he was betrayed, and at the same sitting wherein he ate the passover and instituted the Lord's supper; but whether before the solemnity began, or after it was all over, or between the eating of the passover and...

Commenting on John 13:1-17

John Gill Reformed Baptist @doctorgill

So after he had washed their feet,.... Not Peter's only, but the rest of the disciples also: some have thought, that he washed only the feet of some of them, and not all; but it seems, by this expression, that he performed this service to each of them: and when he had gone through it with everyone of them: and had taken his garments, and...