Adam Clarke on 2 Samuel 24:23

As a king, give unto the king - Literally, All these did King Araunah give unto the king. That there could not be a king of the Jebusites on Mount Moriah, is sufficiently evident; and that there was no other king than David in the land, is equally so: the word המלך hammelech, "the king," given here to Araunah, is wanting in the Septuagint, Syriac, and Arabic; in three of Kennicott's and De Rossi's MSS., and in the parallel place in Chronicles: and, it is very probable, never made a part of the text. Perhaps it should be read, All these did Arnunah give unto the king.

There is, however, a difficulty here. David had taken the fortress of the Jebusites many years before; yet it is evident that Araunah was proprietor of the soil at this time. It is not clear that he was a subject of David; but he paid him respect as a neighbor and a king. This is merely possible.