Isaiah 37:6-7

6Isaiah said to them: “Thus you will say to your master, ‘Thus says Adonai: Do not be afraid of the words you have heard, with which the boys of the king of Assyria have blasphemed Me.

7Behold, I am putting a spirit in him so that he will hear a rumor, and will return to his own country; then I will cause him to fall by the sword in his own land.’”