'Angel of the Lord' in the Bible

Either three years' famine; or three months to be destroyed before thy foes, while the sword of thy enemies overtaketh thee; or else three days the sword of the LORD, even the pestilence, in the land, and the angel of the LORD destroying throughout all the borders of Israel. Now therefore advise thyself what word I shall bring again to him that sent me.

And God sent an angel to Jerusalem to destroy it: and as he was destroying, the LORD beheld, and he repented of the evil, and said to the angel that destroyed, It is enough, stay now thy hand. And the angel of the LORD stood by the threshing-floor of Ornan the Jebusite.

And David lifted up his eyes, and saw the angel of the LORD stand between the earth and the heaven, having a drawn sword in his hand stretched out over Jerusalem. Then David and the elders of Israel, who were clothed in sackcloth, fell upon their faces.

Then the angel of the LORD commanded Gad to say to David, that David should go up, and erect an altar to the LORD in the threshing-floor of Ornan the Jebusite.

But David could not go before it to inquire of God: for he was afraid because of the sword of the angel of the LORD.