'Buy' in the Bible

And Araunah said, Wherefore is my lord the king come to his servant? And David said, To buy the threshing-floor of thee, to build an altar unto Jehovah, that the plague may be stayed from the people.

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 Jehovah my God which cost me nothing. So David bought the threshing-floor and the oxen for fifty shekels of silver.