1 Chronicles 21:28

“At that time when David saw that the Lord had answered him in the threshing floor Of Ornan the Jebusite, etc.] The same with Araunah, (<102416>2 Samuel 24:16), with some small variation of the letters, and are of the same signification; both signifying the “ornus”, as Hillerus f86 observes, the pine tree or ash; (see <234414>Isaiah 44:14), in whose threshingfloor David now was, and where he had been praying and sacrificing; and God had accepted his prayer, as the Targum, and had answered him, by causing fire to come down on the sacrifice and consume it, and by ordering the angel to put up his sword in its sheath: then he sacrificed there; again by the priests, and continued to do so, for he…”

“when David saw that the Lord had answered him . . ., he sacrificed there--or, "he continued to sacrifice there." Perceiving his sacrifice was acceptable, he proceeded to make additional offerings there, and seek favor by prayer and expiatory rites; for the dread of the menacing angel destroying Jerusalem while he was absent in the center of worship at Gibeon, especially reverence for the Divine Being, led him to continue his adorations in that place which God (Ch2 3:1) had hallowed by the tokens of His presence and gracious acceptance. Next: 1 Chronicles Chapter 22”

“Sacrificed - When he perceived that his sacrifice was acceptable to God, he proceeded to offer more sacrifices in that place. 1 Chronicles 21:30”