Albert Barnes Commentary Micah 6:11

"Shall I be pure with wicked balances, and with a bag of deceitful weights?" — Micah 6:11 (ASV)

Shall I count them pure?—Rather, (as the English margin) “Shall I be pure?” The prophet, for the time being, speaks as if he were one of them, and asks them to judge themselves by what would defile him. If it would defile me, how are you, with all your other sins, not defiled?

All these things were expressly forbidden in the law. You shall do no unrighteousness in judgment, in meteyard, in weight, or in measure. Just balances, just weights, a just ephah, and a just hin, you shall have (Leviticus 19:35–36); and, You shall not have in your bag divers weights, a great and a small. You shall not have in your house divers measures, a great and a small. For all that do such things, and all that do unrighteousness, are an abomination to the Lord your God (Deuteronomy 25:13, 15-16; Proverbs 16:11; Proverbs 20:10). Yet are not these things common even now?