2 Samuel 24:22-24

Then Araunah said to David, “Let my lord the king take and offer up what seems good to him. Here are the oxen for the burnt offering and the threshing sledges and the yokes of the oxen for the wood. All this, O king, Araunah gives to the king.” And Araunah said to the king, “May the LORD your God accept you.” But the king said to Araunah, “No, but I will buy it from you for a price. I will not offer burnt offerings to the LORD my God that cost me nothing.” So David bought the threshing floor and the oxen for fifty shekels of silver.