John 6:71 NASB95 - Now He meant Judas [the son] of Simon Iscariot, for he, one of the twelve, was going to betray Him.

John 12:4-5 NASB95 - But Judas Iscariot, one of His disciples, who was intending to betray Him, said, "Why was this perfume not sold for three hundred denarii and given to poor [people?]"
The Textus receptus translates to:
Then saith one of his disciples, Judas Iscariot, son of Simon, which should betray him.

John 13:26 NASB95 - Jesus then answered, "That is the one for whom I shall dip the morsel and give it to him." So when He had dipped the morsel, He took and gave it to Judas, [the son] of Simon Iscariot.