1 Chronicles 21:16-19

16And David lifted his eyes and saw the angel of the Lord standing between earth and heaven, and in his hand a drawn sword stretched out over Jerusalem. Then David and the elders, clothed in sackcloth, fell upon their faces.

17And David said to God, "Was it not I who gave command to number the people? It is I who have sinned and done great evil. But these sheep, what have they done? Please let your hand, O Lord my God, be against me and against my father's house. But do not let the plague be on your people."

18Now the angel of the Lord had commanded Gad to say to David that David should go up and raise an altar to the Lord on the threshing floor of Ornan the Jebusite.

19So David went up at Gad's word, which he had spoken in the name of the Lord.