John 13:27

Satan entered into him. He gave himself up at once to Satan's purpose.

What thou doest, do quickly. Judas understood what these words meant, but no one else.

John 13:30

Went immediately out. It is probable that the Lord's Supper was instituted, at this point, after Judas went out. It was, as we learn from Matthew, after the passover. Matthew's order is as follows: (1) The Passover (Mt 26:17-21); (2) the Exposure of Judas (Mt 26:22-25); (3) the Lord's Supper (Mt 26:26-30). This is John's order, save that he omits, because well known, to record the origin of the Lord's Supper here, and simply tells of the departure of Judas.
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