1 Chronicles 21:16-19

16David looked up and saw the angel of the Lord standing between heaven and earth, with a drawn sword in his hand extended over Jerusalem. Then David and the elders, clothed in sackcloth, fell facedown.

17David said to God, “Was it not I who ordered the fighting men to be counted? I, the shepherd, have sinned and done wrong. These are but sheep. What have they done? Lord my God, let your hand fall on me and my family, but do not let this plague remain on your people.”

18Then the angel of the Lord ordered Gad to tell David to go up and build an altar to the Lord on the threshing floor of Araunah the Jebusite.

19So David went up in obedience to the word that Gad had spoken in the name of the Lord.