What does 2 Kings 19:10 mean?

Tell Hezekiah, king of Judah: 'Don’t let your God, the one you trust, fool you by saying Jerusalem won’t fall into the hands of the king of Assyria.' 2 Kings 19:10 - Modern Text Bible

(Sennacherib tries to shake Hezekiah’s faith, warning him not to trust God’s promise of protection.)