Deuteronomy 27:4-6

4 And when you have crossed over the Jordan, you shall set up these stones, concerning which I command you today, a on Mount Ebal, and you shall plaster them with plaster. 5 And there you shall build an altar to the  Lord your God, an altar of stones. b You shall wield no iron tool on them; 6 you shall build an altar to the  Lord your God of uncut ▼
▼ Hebrew whole
 stones. And you shall offer burnt offerings on it to the  Lord your God,
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