Exodus 20:24-25
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24You shall make an altar of earth for Me, and you shall sacrifice on it your burnt offerings and your peace offerings, your sheep and your oxen; in every place where I cause My name to be remembered, I will come to you and bless you. 25And if you make an altar of stone for Me, you shall not build it of cut stones, for if you wield your chisel on it, you will profane it.