Adam Clarke on 2 Samuel 24:16

The angel stretched out his hand upon Jerusalem - By what means this destruction took place, we know not: it appears that an angel was employed in it, and that this minister of Divine justice actually appeared as an object. of sight; for it is said, 2Sam 24:17, When David saw the angel that smote the people, he said, etc.; and both Ornan and his four sons saw him and were affrighted, 1Chr 21:20.

The threshing-place of Araunah - These threshing-places, we have already seen, were made in the open air. In the parallel place, 1Chr 21:15, 1Chr 21:20, etc., this person is called Ornan. The word that we render Araunah is written in this very chapter אורנה Auarnah, 2Sam 24:16, ארניה Araniah, 2Sam 24:18, ארונה Araunah or Araunah, 2Sam 24:20, and the following: but in every place in 1 Chronicles 21:1-30 where it occurs it is written ארנן Ornan. It is likely he had both names, Araunah and Ornan: but the varieties of spelling in 2 Samuel must arise from the blunders of transcribers.