John 13:11

For he knew his betrayer. Therefore said he, "Ye are not all clean."

John 2:25

and needed not that any man should testify of him. For he knew what was in man.

Matthew 26:24-25

The son of man goeth as it is written of him: but woe be to that man, by whom the son of man shall be betrayed. It had been good for that man, if he had never been born."

John 6:64-71

But there are some of you that believe not." For Jesus knew from the beginning, which they were that believed not. And who should betray him.

John 13:2

And when supper was ended, after that, the devil had put in the heart of Judas Iscariot, Simon's son, to betray him.

John 13:18

"I speak not of you all: I know whom I have chosen: But that the scripture be fulfilled, He that eateth bread with me hath lifted up his heel against me.

John 13:21

When Jesus had thus said, he was troubled in the spirit, and testified saying, "Verily, verily I say unto you, that one of you shall betray me."

John 13:26

Jesus answered, "He it is to whom I give a sop, when I have dipped it." And he wet a sop, and gave it to Judas Iscariot, Simon's son.

John 17:12

While I was with them in the world, I kept them in thy name. Those that thou gavest me, have I kept, and none of them is lost, but that lost child: 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 speak not of you all: I know whom I have chosen: But that the scripture be fulfilled, He that eateth bread with me hath lifted up his heel against me.
John 2:25
and needed not that any man should testify of him. For he knew what was in man.
John 6:64
But there are some of you that believe not." For Jesus knew from the beginning, which they were that believed not. And who should betray him.
John 17:12
While I was with them in the world, I kept them in thy name. Those that thou gavest me, have I kept, and none of them is lost, but that lost child: that the scripture might be fulfilled.
Matthew 26:24
The son of man goeth as it is written of him: but woe be to that man, by whom the son of man shall be betrayed. It had been good for that man, if he had never been born."