Isaiah 37:9

And he heard say concerning Tirhakah, king of Ethiopia, at that time master of the entire country of Egypt, He is come forth to make war with thee, this being the report which, according to Isaiah's promise, was to influence Sennacherib to abandon his campaign. And when he heard it, he sent messengers to Hezekiah, saying, in a second attempt to get possession of Jerusalem and thus to strengthen his cause against Egypt,