Contradiction with 2 Samuel 24:24
1 Chronicles 21:22 records David's request to buy the threshing floor, while 2 Samuel 24:24 details David stating he would pay for it, indicating David's insistence on payment contrary to any suggestion of receiving it freely.
2 Samuel 24:24: And the king said unto Araunah, Nay; but I will surely buy [it] of thee at a price: neither will I offer burnt offerings unto the LORD my God of that which doth cost me nothing. So David bought the threshingfloor and the oxen for fifty shekels of silver.