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I found it.

2 Kings 19:6-7 "And Isaiah said to them, "Thus you shall say to your master, 'Thus says the LORD: "Do not be afraid of the words which you have heard, with which the servants of the king of Assyria have blasphemed Me. Surely I will send a spirit upon him, and he shall hear a rumor and return to his own land; and I will cause him to fall by the sword in his own land."