Deuteronomy 25:13-16

13 You shall not have in your bag two kinds of weights, large and small.
14 You shall not have in your house two kinds of measures, large and small.
15 You shall have only a full and honest weight; you shall have only a full and honest measure, so that your days may be long in the land that the Lord your God is giving you.
16 For all who do such things, all who act dishonestly, are abhorrent to the Lord your God.
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.