'Altar to the Lord' in the Bible

So the angel of the Lord ordered Gad to tell David to go and set up an altar to the Lord on the threshing floor of Ornan the Jebusite.

Then David said to Ornan, “Give me this threshing-floor plot so that I may build an altar to the Lord on it. Give it to me for the full price, so the plague on the people may be stopped.”

He built an altar to the Lord there and offered burnt offerings and fellowship offerings. He called on the Lord, and He answered him with fire from heaven on the altar of burnt offering.