Dt 25:13-16

13^e You shall not keep two differing weights in your bag, one heavy and the other light; 14nor shall you keep two different ephahs^* in your house, one large and the other small. 15But use a full and just weight, a full and just ephah, so that you may have a long life on the land the LORD, your God, is giving you. 16For everyone who does these things, everyone who does what is dishonest, is an abomination to the LORD, your God.^f