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Various Laws
13“You shall not have in your bag differing weights, a large and a small. 14You shall not have in your house differing measures, a large and a small. 15You shall have a correct and honest weight; you shall have a correct and honest measure, so that your days may be prolonged in the land which the Lord your God is giving you. 16For everyone who does these things, everyone who acts unjustly is an abomination to the Lord your God.
Deuteronomy 25:13-16 (NASB)