Isaiah 37:10
Thus shall ye speak to Hezekiah king of Judah, saying, Let not thy God, in whom thou trustest, deceive thee, saying, Jerusalem shall not be given into the hand of the king of Assyria. Thus shall ye speak to Hezekiah king of Judah, saying, Let not thy God, in whom thou trustest, deceive thee, saying, Jerusalem shall not be given into the hand of the king of Assyria.
The verse is a message sent from the Assyrian king to Hezekiah king of Judah with the aim of weakening his trust in God. It threatened that Jerusalem would not escape conquest, appealing to Assyria's destruction of other lands as proof that resistance was hopeless. It charged that God's promise that Jerusalem would not be given into the hand of the king of Assyria was deceptive, seeking to make Hezekiah regard confidence in that promise as being misled.
Hezekiah answered the threat by taking the letter and spreading it before God in prayer. In response God promised that the Assyrians would not attack Jerusalem but would return by the way they came. God Himself defended the city and destroyed the Assyrian army that had boasted against Him. An angel struck down 185,000 Assyrian soldiers in a single night. The outcome shows that human power, however vast and boastful, cannot overcome God's protection of His people.