'Altar' in the Bible

Then Gad came to David on that same day and said to him, "Go up and erect an altar to Yahweh at the threshing floor of Araunah the Jebusite."

Then Araunah said, "Why has my lord the king come to his servant?" David said, "To buy from you the threshing floor, to build an altar to Yahweh who brought a halt to the plague on the people."

David built an altar to Yahweh there, and he offered burnt offerings and fellowship offerings. Then Yahweh responded to [his] prayer for the land and brought the plague to a halt from upon Israel.