He was talking of Judas, the son of Simon Iscariot. It was he who was to be false to Jesus--one of the twelve.

But one of his disciples, Judas Iscariot (who was to give him up), said,

So while a meal was going on, the Evil One having now put it into the heart of Judas Iscariot, Simon's son, to be false to him,

This was the answer Jesus gave: It is the one to whom I will give this bit of bread after I have put it in the vessel. Then he took the bit of bread, put it into the vessel, and gave it to Judas, the son of Simon Iscariot.

Judas (not Iscariot) said to him, How is it that you will let yourself be seen clearly by us and not by the world?