John 13:11

For he knew him who would betray him, therefore he said, "You are not all clean."

John 2:25

and because he did not need anyone to testify concerning man; for he himself knew what was in man.

Matthew 26:24-25

The Son of Man goes, even as it is written of him, but woe to that man through whom the Son of Man is betrayed. It would be better for that man if he had not been born."

John 6:64-71

But there are some of you who do not believe." For Jesus knew from the beginning who they were who did not believe, and who it was who would betray him.

John 13:2

During supper, the devil having already put into the heart of Judas Iscariot, Simon's son, to betray him,

John 13:18

I do not speak concerning all of you. I know whom I have chosen. But that the Scripture may be fulfilled, 'He who eats my bread has lifted up his heel against me.'

John 13:21

When Jesus had said this, he was troubled in spirit, and testified, "Truly, truly, I tell you that one of you will betray me."

John 13:26

Jesus therefore answered, "It is he to whom I will give this piece of bread when I have dipped it." So when he had dipped the piece of bread, he gave it to Judas, the son of Simon Iscariot.

John 17:12

While I was with them, I kept them in your name which you have given me; I have kept. None of them is lost, except 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
I do not speak concerning all of you. I know whom I have chosen. But that the Scripture may be fulfilled, 'He who eats my bread has lifted up his heel against me.'
John 2:25
and because he did not need anyone to testify concerning man; for he himself knew what was in man.
John 6:64
But there are some of you who do not believe." For Jesus knew from the beginning who they were who did not believe, and who it was who would betray him.
John 17:12
While I was with them, I kept them in your name which you have given me; I have kept. None of them is lost, except the son of destruction, that the Scripture might be fulfilled.
Matthew 26:24
The Son of Man goes, even as it is written of him, but woe to that man through whom the Son of Man is betrayed. It would be better for that man if he had not been born."