Jamieson, Fausset and Brown on Micah 3:8

8. I--in contrast to the false prophets (Mi 3:5, 7).

full of power--that which "the Spirit of Jehovah" imparts for the discharge of the prophetical function (Lu 1:17; 24:49; Ac 1:8).

judgment--a sense of justice [Maurer]; as opposed to the false prophets' speaking to please men, not from a regard to truth. Or, "judgment" to discern between graver and lighter offenses, and to denounce punishments accordingly [Grotius].

might--moral intrepidity in speaking the truth at all costs (2Ti 1:7).

to declare unto Jacob his ... sin--(Is 58:1). Not to flatter the sinner as the false prophets do with promises of peace.