Jamieson, Fausset and Brown on Micah 6:11

11. Shall I count them pure--literally, "Shall I be pure with?" &c. With the pure God shows Himself pure; but with the froward God shows Himself froward (Psa 18:26). Men often are changeable in their judgments. But God, in the case of the impure who use "wicked balances," cannot be pure, that is, cannot deal with them as He would with the pure. Vatablus and Henderson make the "I" to be "any one"; "Can I (that is, one) be innocent with wicked balances?" But as "I," in Mi 6:13, refers to Jehovah, it must refer to Him also here.

the bag--in which weights used to be carried, as well as money (De 25:13; Pr 16:11).