2 Samuel 24:21-24

“Why have you come, my lord the king?” Araunah asked. David replied, “I have come to buy your threshing floor and to build an altar to the LORD there, so that he will stop the plague.” “Take it, my lord the king, and use it as you wish,” Araunah said to David. “Here are oxen for the burnt offering, and you can use the threshing boards and ox yokes for wood to build a fire on the altar. I will give it all to you, Your Majesty, and may the LORD your God accept your sacrifice.” But the king replied to Araunah, “No, I insist on buying it, for I will not present burnt offerings to the LORD my God that have cost me nothing.” So David paid him fifty pieces of silver for the threshing floor and the oxen.