2 Samuel 24:24-25

And the king said unto Araunah, Nay; but I will surely buy it of thee at a price: neither will I offer burnt offerings unto the LORD my God of that which doth cost me nothing. So David bought the threshingfloor and the oxen for fifty shekels of silver. 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.