John 13:11

For he knew who was going to betray him; that was why he said, "You are not all of you clean."

John 2:25

and had no need of anybody's evidence about men, for he knew well what was in their hearts.

Matthew 26:24-25

The Son of Man is to go away as the Scriptures say of him, but alas for the man by whom the Son of Man is betrayed! It would have been better for that man if he had never been born!"

John 6:64-71

Yet there are some of you who will not believe." For Jesus knew from the first who would not believe, and who was going to betray him.

John 13:2

So at supper??he devil having by this time put the thought of betraying Jesus into the mind of Judas Iscariot, Simon's son??3 Jesus, fully aware that the Father had put everything into his hands, and that he had come from God and was going back to God,

John 13:18

I do not mean all of you; I know whom I have chosen; but let the Scripture be fulfilled: " 'He who is eating my bread Has raised his heel against me.'

John 13:21

After Jesus had said this he was greatly moved and said solemnly, "I tell you, it is one of you that will betray me!"

John 13:26

Jesus answered, "It is the one to whom I am going to give this piece of bread when I have dipped it in the dish." So he dipped the piece of bread and took it and gave it to Judas, Simon Iscariot's son.

John 17:12

As long as I was with them I kept them by your power which you gave me, and I protected them, and not one of them was lost (except the one who was destined to be lost), so that what the Scripture says might come true.

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 mean all of you; I know whom I have chosen; but let the Scripture be fulfilled: " 'He who is eating my bread Has raised his heel against me.'
John 2:25
and had no need of anybody's evidence about men, for he knew well what was in their hearts.
John 6:64
Yet there are some of you who will not believe." For Jesus knew from the first who would not believe, and who was going to betray him.
John 17:12
As long as I was with them I kept them by your power which you gave me, and I protected them, and not one of them was lost (except the one who was destined to be lost), so that what the Scripture says might come true.
Matthew 26:24
The Son of Man is to go away as the Scriptures say of him, but alas for the man by whom the Son of Man is betrayed! It would have been better for that man if he had never been born!"