St. Luke gives his surname, because there was another Judas. Observe the exceeding iniquity of Judas, that he both sets out by himself, and that he does this for gain. It follows, And he went his way, and communed with the chief priests and captains. By covetousness then Judas became what he was, for it follows, And they covenanted to give him money. Such are the evil passions which covetousness engenders, it makes men irreligious, and compels them to lose all knowledge of God, though they have received a thousand benefits from Him, nay, even to injure Him, as it follows, Andhe contracted with them. -St John Chrysostom