'Costs' in the Bible

But the king said to Araunah, “No, but I will certainly buy it from you for a price. I will not offer burnt offerings to the Lord my God which cost me nothing.” So David purchased the threshing floor and the oxen for fifty shekels of silver.

To the weak I became [as the] weak, to win the weak. I have become all things to all men, so that I may by all means [in any and every way] save some [by leading them to faith in Jesus Christ].