Deuteronomy 27:5-7

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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. ^{Tools
7} There you are to sacrifice fellowship offerings, eat, and rejoice in the presence of the Lord your God.