Ezra 10:5-6

Then arose Ezra, and made the chief priests, the Levites, and all Israel, to swear that they should do according to this word. And they sware. Then Ezra rose up from before the house of God, and went into the chamber of Johanan the son of Eliashib: and when he came thither, he did eat no bread, nor drink water: for he mourned because of the transgression of them that had been carried away.