Jamieson-Fausset-Brown on 2 Samuel 24:18
Araunah--or Ornan (Ch1 21:18), the Jebusite, one of the ancient inhabitants, who, having become a convert to the true religion, retained his house and possessions. He resided on Mount Moriah, the spot on which the temple was afterwards built (Ch2 3:1); but that mount was not then enclosed in the town.
Adam Clarke on 2 Samuel 24:18
Go up, rear an altar unto the Lord - This place is supposed to be Mount Moriah: on which, according to the rabbins, Cain and Abel offered their sacrifices; where Abraham attempted to sacrifice Isaac, and where the temple of Solomon was afterwards built.
John Gill on 2 Samuel 24:19
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.
Keil & Delitzsch on 2 Samuel 24:19–end
David went up to Aravnah according to the command of God.
Sa2 24:20-21
When Aravnah saw the king coming up to him with his servants (ויּשׁקף, "he looked out," viz., from the enclosure of the threshing-floor), he came out, bowed low even to the earth, and asked the king what was the occasion of his coming; whereupon David replied, "To buy the floor from thee, to build an altar to the Lord, that the plague may be turned away from the people."
Sa2 24:22-23
Aravnah replied, "Let my lord the king take and offer up what seemeth good unto him: behold (i.e., there thou hast) the ox for the burnt-offering, and the threshing-machine, and the harness of the ox for wood" (i.e., for fuel). הבּקר, the pa…
Read the whole note in the consoleTyndale Open Study Notes on 2 Samuel 24:17
I am the one who has sinned: David’s earlier confession of sin was limited to his circumstances (“forgive my guilt,” 24:10); now he prayed for those he considered innocent (but see 24:1) and offered to die in their place. • as sheep: David was the shepherd of Israel (see study note on 7:8).