God sent an angel to Jerusalem to destroy it: and as he was about to destroy, Yahweh saw, and he repented him of the evil, and said to the destroying angel, It is enough; now stay your hand. The angel of Yahweh was standing by the threshing floor of Ornan the Jebusite.
So 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 there in the threshingfloor of Ornan the Jebusite ( 1 Chronicles 21:18 ).