'Altar' in the Bible

And Gad came that day to David, and said unto him, Go up, rear an altar unto the LORD in the threshingfloor of Araunah the Jebusite.

And Araunah said, Wherefore is my lord the king come to his servant? And David said, To buy the threshingfloor of thee, to build an altar unto the LORD, that the plague may be stayed from the people.

And David built there an altar unto the LORD, and offered burnt offerings and peace offerings. So the LORD was intreated for the land, and the plague was stayed from Israel.