John 13:11

For he knew who was going to betray him, and that was why he said 'You are not all clean.'

John 2:25

And because he did not need that others should tell him what men were; for he could of himself read what was in men.

Matthew 26:24-25

True, the Son of Man must go, as Scripture says of him, yet alas for that man by whom the Son of Man is being betrayed! For that man 'it would be better never to have been born!'"

John 6:64-71

Yet there are some of you who do not believe in me." For Jesus knew from the first who they were that did not believe in him, and who it was that would betray him;

John 13:2

The Devil had already put the thought of betraying Jesus into the mind of Judas Iscariot, the son of Simon;

John 13:18

I am not speaking about all of you. I know whom I have chosen; but this is in fulfillment of the words of Scripture--'He that is eating my bread has lifted his heel against me.'

John 13:21

After saying this, Jesus was much troubled, and said solemnly: "In truth I tell you that it is one of you who will betray me."

John 13:26

"It is the one," answered Jesus, "to whom I shall give a piece of bread after dipping it in the dish." And, when Jesus had dipped the bread, he took it and gave it to Judas, the son of Simon Iscariot;

John 17:12

Whilst I was with them, I kept them by that revelation, and I have guarded them; and not one of them has been lost, except that lost soul--in fulfillment of Scripture.

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 about all of you. I know whom I have chosen; but this is in fulfillment of the words of Scripture--'He that is eating my bread has lifted his heel against me.'
John 2:25
And because he did not need that others should tell him what men were; for he could of himself read what was in men.
John 6:64
Yet there are some of you who do not believe in me." For Jesus knew from the first who they were that did not believe in him, and who it was that would betray him;
John 17:12
Whilst I was with them, I kept them by that revelation, and I have guarded them; and not one of them has been lost, except that lost soul--in fulfillment of Scripture.
Matthew 26:24
True, the Son of Man must go, as Scripture says of him, yet alas for that man by whom the Son of Man is being betrayed! For that man 'it would be better never to have been born!'"