2 Samuel 24:20-24

20Araunah looked down and saw the king and his servants crossing over toward him; and he went out and bowed before the king with his face toward the ground.

21Araunah said, “Why has my lord the king come to his servant?” And David said, “To buy the threshing floor from you, to build an altar to the Lord, so that the plague may be held back from the people.”

22Araunah said to David, “Let my lord the king take and offer up whatever seems good to him. Look, here are oxen for the burnt offering, and threshing sledges and the yokes of the oxen for the wood.

23All of this, O king, Araunah gives to the king.” And Araunah said to the king, “May the Lord your God be favorable to you.”

24But 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.