'Angel of the Lord' in the Bible

They reported to the angel of the LORD who stood among the myrtle trees, and said, "We have walked back and forth through the earth, and behold, all the earth is at rest and in peace."

Then the angel of the LORD replied, "O LORD of hosts, how long will you not have mercy on Jerusalem and on the cities of Judah, against which you have had indignation these seventy years?"

He showed me Joshua the high priest standing before the angel of the LORD, and Satan standing at his right hand to be his adversary.

I said, "Let them set a clean turban on his head." So they set a clean turban on his head, and clothed him; and the angel of the LORD was standing by.

The angel of the LORD protested to Joshua, saying,

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