Bridges on Proverbs 20:10
Charles Bridges on Proverbs 20:10

10.  Divers weights, and divers measures, both of them are alike abomination to the LORD. {Divers weights: Heb. A stone and a stone} {divers measures: Heb. an ephah and an ephah}
This probably refers to the iniquitous custom of having different weights and measures for buying and for selling — one stone too heavy — the other too light. Such practices seem to have been among the crying sins of the nation, that brought down the judgment of God upon it.† So opposite are they to the character of “a God of truth and without iniquity,”† that the very stone and ephah were abomination to him.† The disuse of barter, and the more accurate system of inspection, have in some measure restrained this gross form of fraud. But the cheats of trickery and close dealing, the evasion of legal duties, taking advantage of the ignorance of the unwary — all those deviations from the scriptural standard are alike abomination to the LORD. ‘A very grievous thing it is to think of the several kinds of frauds and deceits, wherein men are grown wondrous expert, and so shameless withal, that they think it rather a credit to them, as an argument of their perfect understanding in their several mysteries and particular professions, than any blemish to them in their Christian profession.’† What a fearful disclosure will the great day make, to the “shame and everlasting contempt” of the ungodly trafficker! Every man of moral integrity will scorn the flagrant breach of the golden rule. But let this, as every other temptation, be a matter of prayerful watchfulness. And be not satisfied with abstaining from this hateful vice. But blot out its darkness by the bright, steady shining of an upright profession, full of simplicity, love, self-forgetfulness, and active sympathy with our neighbor’s wants. “Let integrity and uprightness preserve me; for I wait on thee.” (Psalm 25:21.)