'Bought' in the Bible

“But the poor man had nothing except one little ewe lambWhich he bought and nourished;And it grew up together with him and his children.It would eat of his bread and drink of his cup and lie in his bosom,And was like a daughter to him.

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