1 Chronicles 21:17 (KJV)

And God sent an angel unto Jerusalem to destroy it: and as he was destroying, the Lord beheld, 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 threshingfloor of Ornan the Jebusite.

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

And David said unto God, Is it not I that commanded the people to be numbered? even I it is that have sinned and done evil indeed; but as for these sheep, what have they done? let thine hand, I pray thee, O Lord my God, be on me, and on my father’s house; but not on thy people, that they should be plagued.

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 in the threshingfloor of Ornan the Jebusite.

And David went up at the saying of Gad, which he spake in the name of the Lord.