John Gills Exposition of the Bible Commentary - 2 Samuel 24:18
And Gad came that day to David ,.... Ordered and directed by the angel of the Lord, 1 Chronicles 21:18 , and said unto him, go up, rear an altar unto the Lord in the threshing floor of Araunah the Jebusite : it was too far to go to Gibeon, where the tabernacle was, at such a time of extremity, when the sword of the angel was stretched out over Jerusalem, 1 Chronicles 21:29 ; and this was the most proper place, as it was the very spot over and nearest to which the angel was; and was... read more
Matthew Henry's Complete Commentary - 2 Samuel 24:18-25
Here is, I. A command sent to David to erect an altar in the place where he saw the angel, 2 Sam. 24:18. This was to intimate to David, 1. That, upon his repeated submission and humiliation, God was now thoroughly reconciled to him; for, if the Lord had been pleased to kill him, he would not have accepted an offering, and therefore would not have ordered him to build an altar. God's encouraging us to offer to him spiritual sacrifices is a comfortable evidence of his reconciling us to himself.... read more