'Angel of the Lord' in the Bible

Either three years' famine; or three months to be destroyed before your foes, while that the sword of your enemies overtakes you; 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 territory of Israel. Now therefore decide what word I shall bring again to him that sent me.

And God sent an angel unto Jerusalem to destroy it: and as he was destroying, the LORD beheld, and he relented of the disaster, and said to the angel that destroyed, It is enough, restrain now your hand. And the angel of the LORD stood by the threshingfloor 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 set up an altar unto the LORD in the threshingfloor 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.