John 13:11

For he know the man that was delivering him up; therefore, said he - Not ye all, are pure.

John 2:25

and because he had, no need, that anyone should bear witness concerning man; for, he, understood what was in man.

Matthew 26:24-25

The Son of Man, indeed, goeth his way, according as it is written concerning him, - But alas! for that man, through whom the Son of Man, is being delivered up: Well, had it been for him, if, that man, had not been born!

John 6:64-71

But there are some from among you, who do not believe. For Jesus knew from the beginning, who they were that did not believe, and who it was would deliver him up; -

John 13:2

And, supper, being in progress, the adversary, having already thrust into the heart of Judas son of Simon Iscariot, that he should deliver him up, -

John 13:18

Not, concerning you all, am I speaking, - for, I, know of whom I made choice; but -- that, the Scripture, might be fulfilled: He that feedeth on my bread, hath lifted up against me, his heel.

John 13:21

These things, having said, Jesus, was troubled in spirit, and bare witness, and said - Verily, verily, I say unto you - One from among you, will deliver me up.

John 13:26

Jesus, therefore, answereth - That one, it is, for whom, I, shall dip the morsel, and give unto him. So, dipping the morsel, he taketh and giveth it unto Judas, son of Simon Iscariot.

John 17:12

When I was with them, I, kept them in thy name which thou hast given me, - And I kept watch, and, none from among them, went the destruction, - save the son of destruction, that, the Scripture, might be fulfilled.

Treasury of Scripture Knowledge

Summary

For he knew who should betray him; therefore said he, Ye are not all clean.

Bible References

General references

John 13:18
Not, concerning you all, am I speaking, - for, I, know of whom I made choice; but -- that, the Scripture, might be fulfilled: He that feedeth on my bread, hath lifted up against me, his heel.
John 2:25
and because he had, no need, that anyone should bear witness concerning man; for, he, understood what was in man.
John 6:64
But there are some from among you, who do not believe. For Jesus knew from the beginning, who they were that did not believe, and who it was would deliver him up; -
John 17:12
When I was with them, I, kept them in thy name which thou hast given me, - And I kept watch, and, none from among them, went the destruction, - save the son of destruction, that, the Scripture, might be fulfilled.
Matthew 26:24
The Son of Man, indeed, goeth his way, according as it is written concerning him, - But alas! for that man, through whom the Son of Man, is being delivered up: Well, had it been for him, if, that man, had not been born!