2 Samuel 24:24

24:24 But the king said to Araunah, “No, I insist on buying it from you! I will not offer to the Lord my God burnt sacrifices that cost me nothing.”

So David bought the threshing floor and the oxen for fifty pieces of silver. ¹ 

[24:24]  ¹ tn Heb “fifty shekels of silver.” This would have been about 20 ounces (568 grams) of silver by weight.