Mark 14:10
Now Judas Iscariot, who was one of the twelve apostles, left and went to the leading priests in order to make arrangements for turning Jesus over to them.
John 13:2
The devil had already filled the heart of Judas Iscariot, Simon's son, with the desire to turn Jesus over [i.e., to the Jewish authorities]. During the [Passover] meal,
Matthew 26:14-16
Then one of the twelve apostles, named Judas Iscariot, went to the leading priests
Luke 22:3-6
Then Satan entered the heart of Judas, called Iscariot, who was one of the twelve apostles.
Matthew 10:4
Simon, the Cananean [i.e., the same as the Zealot. See Luke 6:15], and Judas Iscariot, who also [besides being an apostle] was His betrayer.
John 13:30
So, after eating the piece of bread, Judas went out immediately. And it was nighttime.
Mark 3:19
and Judas Iscariot, who also betrayed Him. Then Jesus went into a house.
John 6:70-71
Jesus answered them, "Did I not choose [all] twelve of you, and one of you is a devil?" [Note: The word "devil" means "adversary" or "opponent"].