Peter, and John form another group of three. Judas is wearing red, blue, and green and is in shadow, looking withdrawn and taken aback by the sudden revelation of his plan. He is clutching a small bag, perhaps signifying the silver given to him as payment to betray Jesus, or perhaps a reference to his role as a treasurer. He is also tipping over the salt cellar, which may be related to the near-Eastern expression to "betray the salt" meaning to betray one's master. He is the only person to have his elbow on the table and his head is also vertically the lowest of anyone in the painting. Peter wears an expression of anger and appears to be holding a knife, foreshadowing his violent reaction in Gethsemane during the arrest of Jesus. Peter is leaning towards John and touching him on the shoulder, in reference to John's Gospel where he signals the "beloved disciple" to ask Jesus who is to betray him. The youngest apostle, John, appears to swoon and lean towards Peter. Jesus Thomas, James the Greater, and Philip are the next group of three. Thomas is clearly upset; the raised index finger foreshadows his incredulity of the Resurrection. James the Greater looks stunned, with his arms in the air. Meanwhile, Philip appears to be requesting some explanation. Matthew, Jude Thaddeus, and Simon the Zealot are the final group of three. Both Thaddeus and Matthew are turned toward Simon, perhaps to find out if he has any answer to their initial questions. In common with other depictions of the Last Supper from this period, Leonardo seats the diners on one side of the table, so that none of them has his back to the viewer. The tablecloth is white with blue stripes, which are colours commonly associated with the Jewish people. This is the painting's only overt reference to the ethnicity of Jesus and his disciples. Most previous depictions excluded Judas by placing him alone on the opposite side of the table from the other eleven disciples and Jesus, or placing halos around all the disciples except Judas. Leonardo instead has Judas lean back into shadow. Jesus is predicting that his betrayer will take the bread at the same time he does to Thomas and James the Greater to his left, who react in horror as Jesus points with his left hand to a piece of bread before