Charles Spurgeon Commentary 1 Chronicles 21:15

"And God sent an angel unto Jerusalem to destroy it: and as he was about to destroy, Jehovah beheld, and he repented him of the evil, and said to the destroying angel, It is enough; now stay thy hand. And the angel of Jehovah was standing by the threshing-floor of Ornan the Jebusite." — 1 Chronicles 21:15 (ASV)

And he repented him of the evil, and said to the angel that destroyed, It is enough, stay now thine hand. And the angel of the LORD stood by the threshing floor of Ornan the Jebusite.

One of the old inhabitants of the land, who had escaped destruction, and had his possession on the top of Mount Morah.