John 13:11

For he knew him that was to betray him; therefore, he said, You are not all pure.

John 2:25

for he had no need that any should testify of man, for he knew what was in man.

Matthew 26:24-25

The Son of man goes indeed, as it is written of him, but woe to that man by whom the Son of man is betrayed! it would be good for him if that man had not been born.

John 6:64-71

But there are some of you who believe not. For Jesus knew from the beginning who they were that believed not, and who he was that would betray him.

John 13:2

And supper being over, the devil having already put it in the heart that Judas Iscariot, the son of Simon, should betray him,

John 13:18

I speak not of you all; I know whom I have chosen; but that the Scripture may be fulfilled, He that eats bread with me has lifted up his heel against me.

John 13:21

Having said these things Jesus was troubled in spirit, and testified and said, I tell you most truly, that one of you shall betray me.

John 13:26

Then Jesus answered, It is he to whom I will dip and give the mouthful. Then dipping the mouthful, he took and gave it to Judas, the son of Simon Iscariot.

John 17:12

When I was with them in the world, I kept them in thy name which thou gayest me, and preserved [them], and no one of them has been lost, except the son of perdition, 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 may be fulfilled, He that eats bread with me has lifted up his heel against me.
John 2:25
for he had no need that any should testify of man, for he knew what was in man.
John 6:64
But there are some of you who believe not. For Jesus knew from the beginning who they were that believed not, and who he was that would betray him.
John 17:12
When I was with them in the world, I kept them in thy name which thou gayest me, and preserved [them], and no one of them has been lost, except the son of perdition, that the Scripture might be fulfilled;
Matthew 26:24
The Son of man goes indeed, as it is written of him, but woe to that man by whom the Son of man is betrayed! it would be good for him if that man had not been born.