John 13:11

For He knew who was going to betray Him; for that reason He said, “Not all of you are clean.”

John 2:25

and He did not need anyone to testify concerning man [and human nature], for He Himself knew what was in man [in their hearts—in the very core of their being].

Matthew 26:24-25

The Son of Man is to go [to the cross], just as it is written [in Scripture] of Him; but woe (judgment is coming) to that man by whom the Son of Man is betrayed! It would have been good for that man if he had never been born.”

John 6:64-71

But [still] there are some of you who do not believe and have faith.” For Jesus knew from the beginning who did not believe, and who would betray Him.

John 13:2

It was during supper, when the devil had already put [the thought of] betraying Jesus into the heart of Judas Iscariot, Simon’s son,

John 13:18

I am not speaking of all of you. I know whom I have chosen; but [this has happened] in order that the Scripture may be fulfilled: ‘He who eats My bread has raised up his heel against Me [as My enemy].’

John 13:21

After Jesus had said these things, He was troubled in spirit, and testified and said, “I assure you and most solemnly say to you, one of you will betray Me and hand Me over.”

John 13:26

Jesus answered, “It is the one to whom I am going to give this piece [of bread] after I have dipped it.” So when He had dipped the piece of bread [into the dish], He gave it to Judas, 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 protected them, and not one of them was lost except the son of destruction, 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 am not speaking of all of you. I know whom I have chosen; but [this has happened] in order that the Scripture may be fulfilled: ‘He who eats My bread has raised up his heel against Me [as My enemy].’
John 2:25
and He did not need anyone to testify concerning man [and human nature], for He Himself knew what was in man [in their hearts—in the very core of their being].
John 6:64
But [still] there are some of you who do not believe and have faith.” For Jesus knew from the beginning who did not believe, and who 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 protected them, and not one of them was lost except the son of destruction, so that the Scripture would be fulfilled.
Matthew 26:24
The Son of Man is to go [to the cross], just as it is written [in Scripture] of Him; but woe (judgment is coming) to that man by whom the Son of Man is betrayed! It would have been good for that man if he had never been born.”