1 Chronicles 21:19

floor; where having built an altar, God gives a sign of his favour by fire, and stays the plague.

Overview - 1 Chronicles 21
1	David, tempted by Satan, forces Joab to number the people.
5	The number of the people being brought, David repents of it.
9	David having three plagues propounded by God, chooses the pestilence.
14	After the death of seventy thousand, David by repentance prevents the destruction of Jerusalem.
18	David, by Gad's direction, purchases Ornan's threshing-
28	David sacrifices there, being restrained from Gibeon by fear of the angel.

Treasury of Scripture Knowledge

1 Chronicles 21:19 (King James Version)
And David went up at the saying of Gad, which he spake in the name of the LORD.