Psalm 46:5 (ESV)

5 God is in the midst of her; she shall not be moved; God will help her when morning dawns.

Faith in the Lord had ultimately saved Israel. Sennacherib was not able to topple Jerusalem. When morning dawns refers to a specific moment described to us in 2 Kings 19:35: And that night the angel of the Lord went out and struck down 185,000 in the camp of the Assyrians. And when people arose early in the morning, behold, these were all dead bodies.