John 13:11

For He knew the one who was betraying Him; for this reason He said, “Not all of you are 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 is to go, just as it is written of Him; but woe to that man by whom the Son of Man is betrayed! It would have been good 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 that would betray Him.

John 13:2

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

John 13:18

I do not speak of all of you. I know the ones I have chosen; but it is 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 became troubled in spirit, and testified and said, “Truly, truly, I say to you, that one of you will betray Me.”

John 13:26

Jesus then *answered, “That is the one for whom I shall dip the morsel and give it to him.” So when He had dipped the morsel, He *took and *gave it to Judas, the son of Simon Iscariot.

John 17:12

While I was with them, I was keeping them in Your name which You have given Me; and I guarded them and not one of them perished but the son of perdition, so that the Scripture would 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 of all of you. I know the ones I have chosen; but it is 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 that would betray Him.
John 17:12
While I was with them, I was keeping them in Your name which You have given Me; and I guarded them and not one of them perished but the son of perdition, so that the Scripture would be fulfilled.
Matthew 26:24
The Son of Man is to go, just as it is written of Him; but woe to that man by whom the Son of Man is betrayed! It would have been good for that man if he had not been born.”