Deuteronomy 25:13-15

Thou shalt not have in thy bag divers weights, a great and a small. {divers...: Heb. a stone and a stone} Thou shalt not have in thine house divers measures, a great and a small. {divers...: Heb. an ephah and an ephah} {But} thou shalt have a perfect and just weight, a perfect and just measure shalt thou have: that thy days may be lengthened in the land which the LORD thy God giveth thee.