Charles Ellicott Commentary Deuteronomy 25:13-16

"Thou shalt not have in thy bag diverse weights, a great and a small. Thou shalt not have in thy house diverse measures, a great and a small. A perfect and just weight shalt thou have; a perfect and just measure shalt thou have: that thy days may be long in the land which Jehovah thy God giveth thee. For all that do such things, [even] all that do unrighteously, are an abomination unto Jehovah thy God." — Deuteronomy 25:13-16 (ASV)

Deuteronomy 25:13–16. JUST WEIGHTS AND MEASURES.

So Leviticus 19:35-36. Among the laws of moral holiness comes the law of just weights and measures.

An abomination to the Lord. So in Proverbs 11:1, a false balance is abomination to the Lord. (See also Amos 8:4-8.) The protection of the poor is the chief practical end in this; rich men can take care of themselves. Poor men are doubly robbed by short weight and measure, because they cannot protect themselves against it. The injustice tends to perpetuate their poverty.