You must not use dishonest measures of length, weight, or volume.
Leviticus 19:35 Ye shall do no unrighteousness in judgment. If you take the word judgment in its strict sense, this will be a special precept, that judges should faithfully do justice to all, and not subvert just causes from favor or ill-will.
Here is, I. A law for the preserving of the honour of the time and place appropriated to the service of God, Lev 19:30. This would be a means to secure them both from the idolatries and superstitions of the heathen and from all immoralities in conversation. 1. Sabbaths must be religiously observed, and not those times mentioned (Lev 19:26) to which the heathen had a superstitious regard. 2.
Commenting on Leviticus 19:30-37
Ye shall do no unrighteousness in judgment,.... This is repeated from Lev 19:15; and in order to lead on to some other laws and instructions; though Aben Ezra thinks this is said in connection with the preceding words, and in reference to the stranger, agreeably to Deu 1:16; but Jarchi refers it to what follows concerning weights and measures, and observes, that a measurer is...