'Angel of the Lord' in the Bible

Then they reported to the angel of the LORD who stood among the myrtle trees, "We have wandered throughout the earth and look! the entire earth is at rest. Everything is quiet and peaceful."

And the angel of the LORD replied, "LORD of the Heavenly Armies, how long will it be until you show mercy to Jerusalem and to the cities of Judah, with whom you have been angry for these past seventy years?"

Then I saw Joshua the High Priest standing in the presence of the angel of the LORD, with Satan standing at his right to oppose him.

Then I said, "Let them place a pure diadem on his head." So they placed the pure diadem on his head and clothed him with fine garments while the angel of the LORD was standing beside them.

Then the angel of the LORD gave this charge to Joshua:

At that time, the LORD will defend those who live in Jerusalem, and the one who is feeble among them at that time will be like David. The entire house of David will be like God indeed, like the angel of the LORD in their midst!