“No,” replied the king, “I insist on paying a price, for I will not offer to the LORD my God burnt offerings that cost me nothing.” So David bought the threshing floor and the oxen for fifty shekels of silver.
Jewish Publication Society of America Version (JPS1917) - 2 Samuel 24:24 >And the king said unto Araunah: 'Nay; but I will verily buy it of thee at a price; neither will I offer burnt-offerings unto the LORD my God which cost me nothing.' So David bought the threshing-floor and the oxen for fifty shekels of silver.