2 Samuel 24:22-24

22Araunah said to David, ‘My lord the king, take anything that you would like to offer to the Lord. You can take these oxen to offer as sacrifices. You can use the wood from these tools and yokes to make a fire.

23I will give all these things to you sir, my lord the king.’ Araunah also said to the king, ‘I pray that the Lord your God will accept your offerings.’

24But the king said to Araunah, ‘No, I must pay you for it. I will not burn as an offering to the Lord my God any sacrifice that costs me nothing.’ So David bought Araunah's threshing floor and his oxen for 50 silver coins.