John Chrysostom — as excerpted in the Catena Aurea on Matthew 26:26

“(Hom. lxxxii.) And this John shews when he says, After the sop, Satan entered into him John 13:27. For his sin was aggravated in that he came near to these mysteries with such a heart, and that having come to them, he was made better neither by fear, kindness, nor honour. Christ hindered him not, though He knew all things, that you may learn that He omits nothing which serves for correction.”