'Altar to the Lord' in the Bible

Gad came to David that day and said to him, “Go up and set up an altar to the Lord on the threshing floor of Araunah the Jebusite.”

Araunah said, “Why has my lord the king come to his servant?”David replied, “To buy the threshing floor from you in order to build an altar to the Lord, so the plague on the people may be halted.”

He built an altar to the Lord there and offered burnt offerings and fellowship offerings. Then the Lord answered prayer on behalf of the land, and the plague on Israel ended.