'Angel of the Lord' in the Bible

So they answered the angel of the Lord who was standing among the myrtle trees and said, “We have patrolled the earth, and behold, all the earth is peaceful and quiet.”

Then the angel of the Lord said, “O Lord of hosts, how long will You have no compassion for Jerusalem and the cities of Judah, with which You have been indignant these seventy years?”

Then he showed me Joshua the high priest standing before the angel of the Lord, and Satan standing at his right hand to accuse him.

Then I said, “Let them put a clean turban on his head.” So they put a clean turban on his head and clothed him with garments, while the angel of the Lord was standing by.

And the angel of the Lord admonished Joshua, saying,

In that day the Lord will defend the inhabitants of Jerusalem, and the one who is feeble among them in that day will be like David, and the house of David will be like God, like the angel of the Lord before them.