'Angel of the Lord' in the Bible

The angel of the LORD found her by a fountain of water in the wilderness, by the fountain in the way to Shur.

The angel of the LORD said to her, "Return to your mistress, and submit yourself under her hands."

The angel of the LORD said to her, "I will greatly multiply your seed, that they will not be numbered for multitude."

The angel of the LORD said to her, "Behold, you are with child, and will bear a son. You shall call his name Ishmael, because the LORD has heard your affliction.

The angel of the LORD called to him out of the sky, and said, "Abraham, Abraham." He said, "Here I am."

The angel of the LORD called to Abraham a second time out of the sky,