Deuteronomy 27:4-6

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4} When you have crossed the Jordan, you are to set up these stones on Mount Ebal, as I am commanding you today, and you are to cover them with plaster. ^{Tools
5} Build an altar of stones there to the Lord your God—you must not use any iron tool on them.^(A) ^{Tools
6} Use uncut stones to build the altar of the Lord your God and offer burnt offerings to the Lord your God on it.