John 13:2
“And supper being ended, the devil having now put it into the heart of Judas to betray Him.”
This the Evangelist has said amazed, showing that Jesus washed the man who had already chosen to betray Him. This also proves his great wickedness, that not even the having shared the salt restrained him, (a thing which is most able to restrain wickedness;) not the fact that even up to the last day, his Master continued to bear with him.
Source: Homilies on the Gospel of John (New Advent)