Named as one of the 12 apostles:
Matthew 10:4 Simon the Canaanite, and Judas Iscariot, who also betrayed him.
Luke 6:16 And Judas the brother of James, and Judas Iscariot, which also was the traitor.
All 12 follow Jesus:
Mark 3:19 And Judas Iscariot, which also betrayed him: and they went into an house.
The Lord predicts one of the twelve will betray him:
John 6:71 He spake of Judas Iscariot the son of Simon: for he it was that should betray him, being one of the twelve.
Judas questions use of very costly spikenard:
John 12:4 Then saith one of his disciples, Judas Iscariot, Simon’s son, which should betray
Goes to the Priests and sells out the Lord:
Matthew 26:14 Then one of the twelve, called Judas Iscariot, went unto the chief priests,
Mark 14:10 And Judas Iscariot, one of the twelve, went unto the chief priests, to betray him unto them.
At the Last Supper:
Matthew 26:25 Then Judas, which betrayed him, answered and said, Master, is it I? He said unto him, Thou hast said.
John 13:2 And supper being ended, the devil having now put into the heart
Luke 22:3 Then entered Satan into Judas surnamed Iscariot, being of the number of the twelve.
John 13:26 Jesus answered, He it is, to whom I shall give a sop, when I have dipped it. And when he had dipped the sop, he gave it to Judas Iscariot, the son of Simon.
John 13:29 For some of them thought, because Judas had the bag, that Jesus had said unto him, Buy those things that we have need of against the feast; or, that he should give something to the poor.
Brings soldiers to the Garden and betrays the Lord:
Matthew 26:47 And while he yet spake, lo, Judas, one of the twelve, came, and with him a great multitude with swords and staves, from the chief priests and elders of the people.
Mark 14:43 And immediately, while he yet spake, cometh Judas, one of the twelve, and with him a great multitude with swords and staves, from the chief priests and the scribes and the elders.
Luke 22:47-48 And while he yet spake, behold a multitude, and he that was called Judas, one of the twelve, went before them, and drew near unto Jesus to kiss him. But Jesus said unto him, Judas, betrayest thou the Son of man with a kiss?
John 18:2-3 And Judas also, which betrayed him, knew the place: for Jesus ofttimes resorted thither with his disciples. Judas then, having received a band of men and officers from the chief priests and Pharisees, cometh thither with lanterns and torches and weapons.
John 18:5 They answered him, Jesus of Nazareth. Jesus saith unto them, I am he. And Judas also, which betrayed him, stood with them.
Tries to return money:
Matthew 27:3 Then Judas, which had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders, …..and hanged himself (vs 5)
His apostleship must be filled:
Acts 1:16-18 Men and brethren, this scripture must needs have been fulfilled, which the Holy Ghost by the mouth of David spake before concerning Judas, which was guide to them that took Jesus. For he was numbered with us, and had obtained part of this ministry. Now this man purchased a field with the reward of iniquity; and falling headlong, he burst asunder in the midst, and all his bowels gushed out.