'Angel of the Lord' in the Bible

But God was moved to wrath because he went: and the angel of the Lord took up a position in the road to keep him from his purpose. Now he was seated on his ass, and his two servants were with him.

And the ass saw the angel of the Lord waiting in the road with his sword in his hand; and turning from the road, the ass went into the field; and Balaam gave the ass blows, to get her back on to the road.

Then the angel of the Lord took up his position in a narrow road through the vine-gardens, with a wall on this side and on that.

And the ass saw the angel of the Lord, and went near the wall, crushing Balaam's foot against the wall; and he gave her more blows.

Then the angel of the Lord went further, stopping in a narrow place where there was no room for turning to the right or to the left.

And the ass saw the angel of the Lord and went down on the earth under Balaam; and full of wrath, Balaam gave her hard blows with his stick.

Then the Lord made Balaam's eyes open, and he saw the angel of the Lord in the way with his sword in his hand: and he went down on his face to the earth.

And the angel of the Lord said to him, Why have you given your ass blows these three times? See, I have come out against you to keep you back, because your purpose is not pleasing to me.

And Balaam said to the angel of the Lord, I have done wrong, for I did not see that you were in the way against me: but now, if it is evil in your eyes, I will go back again.

And the angel of the Lord said to Balaam, Go with the men; but say only what I give you to say. Then Balaam went on with the chiefs of Balak.