1 Chronicles 21:16-19

16And 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. 17And David said to God, Is it not I that commanded the people to be numbered? even I it is that have sinned and done evil indeed; but as for these sheep, what have they done? let thy hand, I pray thee, O LORD my God, be on me, and on my father’s house; but not on thy people, that they should be afflicted.

18Then the angel of the LORD commanded Gad to say to David, that David should go up, and build an altar to the LORD in the threshingfloor of Ornan the Jebusite. 19And David went up at the saying of Gad, which he spoke in the name of the LORD.