John Gill Commentary 2 Samuel 24:19

"And David went up according to the saying of Gad, as Jehovah commanded." — 2 Samuel 24:19 (ASV)

And David, according to the saying of Gad, went up as the Lord commanded. From the place where he was in a lower part of the city to Mount Moriah, on which was the threshing floor, a place fit for winnowing corn when threshed.