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 

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