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."
Cross References (ranked by relevance)
For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.
Yea, mine own familiar friend, in whom I trusted, which did eat of my bread, hath lifted up his heel against me.
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.
Him, being delivered by the determinate counsel and foreknowledge of God, ye have taken, and by wicked hands have crucified and slain: