'Altar to the Lord' in the Bible

Then the angel of the Lord commanded Gad to say to David, that David should go up and build an altar to the Lord on the threshing floor of Ornan the Jebusite.

Then David said to Ornan, “Give me the site of this threshing floor, that I may build on it an altar to the Lord; for the full price you shall give it to me, that the plague may be restrained from the people.”

Then David built an altar to the Lord there and offered burnt offerings and peace offerings. And he called to the Lord and He answered him with fire from heaven on the altar of burnt offering.