Deuteronomy 25:13-16
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13"You shall not have in your bag two kinds of weights, a large and a small. 14You shall not have in your house two kinds of measures, a large and a small. 15A full and just weight you shall have, a full and just measure you shall have; that your days may be prolonged in the land which the LORD your God gives you. 16For all who do such things, all who act dishonestly, are an abomination to the LORD your God.
Deuteronomy 25:13-16 (RSV)