Luke 22:3

And Satan entered into Judas. The meaning only seems to be, that the devil tempted and overcame him. (Witham) --- Satan entered into Judas not all at once, but by degrees. He first gained possession by avarice, next by theft, and lastly he impelled him to the blackest treachery and cruel parricide. The Scripture only says that Satan had entered into him when he was entirely abandoned to iniquity, had hardened his heart against all grace, and shut his ears against every instruction of Jesus. In like manner the Scripture says of a good man, who is strengthened in grace, that the Holy Spirit dwells in him. (Calmet)