2 Samuel (Author Compiled by Isaiah from records of Samuel, David, Nathan, and Gad.)
24:24And the king said to Araunah, No; but I will in any case buy them of thee at a price: neither will I offer up to Jehovah my God burnt-offerings without cost. And David bought the threshing-floor and the oxen for fifty shekels of silver.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.