'Angel of the Lord' in the Bible

Then Joseph woke up from his sleep and did what the angel of the Lord commanded him and took Mary to be his wife.

Now there had been a violent earthquake, for an angel of the Lord had descended from heaven and, [having] come to roll away the stone, was [now] sitting on it.

For an angel of the Lord came down to the pool [from heaven] at certain times and stirred up the water. Then the first person to enter the pool after the water became choppy was healed from whatever disease he had."}}