'Angel of the Lord' in the Bible

An angel of the Lord, however, opened the prison doors at night and led them out.

Meanwhile an angel of the Lord had said to Philip: "Set out on a journey southwards, along the road that runs down from Jerusalem to Gaza." (It is now deserted).

Suddenly an angel of the Lord stood by him, and a light shone in the cell. The angel struck Peter on the side, and roused him with the words: "Get up quickly."

Instantly an angel of the Lord struck him, because he did not give God the glory; and he was attacked with worms, and died.