Satan entered into Judas (eishlqen ei Ioudan). Ingressive aorist active indicative. Satan was now renewing his attack on Jesus suspended temporarily ( Luke 4:13 ) "until a good chance." He had come back by the use of Simon Peter ( Mark 8:33 ; Matthew 16:23 ). The conflict went on and Jesus won ultimate victory ( Luke 10:18 ). Now Satan uses Judas and has success with him for Judas allowed him to come again and again ( John 13:27 ). Judas evidently opened the door to his heart and let Satan in. Then Satan took charge and he became a devil as Jesus said ( John 6:70 ). This surrender to Satan in no way relieves Judas of his moral responsibility.