Joh 13:27-30 After the morsel, Satan then entered into him. Therefore Jesus *said to him, "What you do, do quickly." (30) So after receiving the morsel he went out immediately; and it was night.
at least mat and luke don't appear to mention it. of course, according to john, none of the other disciples knew why judas left.
unfortunately, john doesn't include the communion in this passage, so it's impossible to say whether it was before or after the last supper.
Each man's knowledge is genuine to the extent that it is confirmed by gentleness, humility, and love. - st. mark the ascetic.
You move from fear to religious devotion, from which springs spiritual knowledge; from this knowledge comes judgment, that is, discrimination; from discrimination comes the strength that leads to understanding; from thence you come to wisdom. - st. peter of damaskos