'Angel of the Lord' in the Bible

But the angel of the LORD spoke to Elijah the foreigner, "Get up and go meet the messengers from the king of Samaria. Ask them "Is it because there is no God in Israel that you're going to consult with Ekron's god Baal-zebub?

The angel of the LORD told Elijah, "Go down the hill with that man. Don't be afraid of him!" So Elijah got up and went down with him to meet the king.

That very night, the angel of the LORD went out to the camp of the Assyrian army and killed 185,000 men. Early the next morning, when the army of Israel arose, all 185,000 soldiers were dead.