2 Samuel 24:24 New King James Version (NKJV)
24 Then the king said to Araunah, “No, but I will surely buy it from you for a price; nor will I offer burnt offerings to the Lord my God with that which costs me nothing.” So David bought the threshing floor and the oxen for fifty shekels of silver.
2 Samuel 24:24 New International Version (NIV)
24 But the king replied to Araunah, “No, I insist on paying you for it. I will not sacrifice to the Lord my God burnt offerings that cost me nothing.”
So David bought the threshing floor and the oxen and paid fifty shekels[a] of silver for them.