'Angel of the Lord' in the Bible

But the angel of the Lord said to Elijah the Tishbite, “Go and meet the messengers of the king of Samaria and ask them, ‘Is it because there is no God in Israel that you are going to inquire of Baal-zebub, the god of Ekron?’

The angel of the Lord said to Elijah, “Go down with him. Don’t be afraid of him.” So he got up and went down with him to the king.

That night the angel of the Lord went out and struck down 185,000 in the camp of the Assyrians. When the people got up the next morning—there were all the dead bodies!