2 Samuel 15:1
And it came to pass after this, that Absalom prepared him chariots and horses, and fifty men to run before him.
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.