פּירוש אויף שמואל ב 24:16

The Yevusite. He was the chief officer of the Zion fortress the name of which is Yevusi.²²Having formerly belonged to them, see earlier verses 5:6–5:9.

And the angel stretched out his hand - The Holy One projected the image of an angel with a drawn sword in his hand stretched over Jerusalem. He placed it next to the threshing floor of Aravnah the Jebusite in order that David would see it there and pray, and that Gd would be entreated of him there in that place. Then when the plague stopped it would be a sign to David that this is the place of entreaty and there will be the Holy Temple, the house of prayer and service - just as Gd commanded him through the prophet Gad to build there an altar. His prayer was answered through fire which came down from the heavens to consume his offering as it says in Divre HaYamim.