'Angel of the Lord' in the Bible

The riders then agreed with the angel of the Lord, who was standing among the myrtle trees, "We have been walking about on the earth, and now everything is at rest and quiet."

The angel of the Lord then asked, "Lord who rules over all, how long before you have compassion on Jerusalem and the other cities of Judah which you have been so angry with for these seventy years?"

Next I saw Joshua the high priest standing before the angel of the Lord, with Satan standing at his right hand to accuse him.

Then I spoke up, "Let a clean turban be put on his head." So they put a clean turban on his head and clothed him, while the angel of the Lord stood nearby.

Then the angel of the Lord exhorted Joshua solemnly:

On that day the Lord himself will defend the inhabitants of Jerusalem, so that the weakest among them will be like mighty David, and the dynasty of David will be like God, like the angel of the Lord before them.