John Chrysostom — as excerpted in the Catena Aurea on John 13:6-11

“(Hom. lxx. 2) He does not say on what account He performs this act of washing, but only threatens him. For Peter was not persuaded by the first answer: Thou shalt know hereafter: he did not say, Teach me then that I may submit. But when he was threatened with separation from Christ, then he submitted.”