'Altar to the Lord' in the Bible

The angel of the LORD told Gad to tell David that David was to go up and build an altar to the LORD on the threshing floor that belonged to Ornan the Jebusite.

David told Ornan, "Give me the threshing floor as a site to build an altar to the LORD on it. Give it to me at its full price, so the plague may be averted from the people."

built an altar to the LORD there, and presented burnt offerings and peace offerings. He called out to the LORD, and he answered him from heaven with fire on the altar of burnt offerings.