Though Judah is to survive the fall of Ephraim, yet “they also” (the men of Judah) have perpetrated like sins to those of Samaria (Isa 5:3, Isa 5:11), which must be chastised by God.
erred ... are out of the way - “stagger ... reel.” Repeated, to express the frequency of the vice.
priest ... prophet - If the ministers of religion sin so grievously, how much more the other rulers (Isa 56:10, Isa 56:12)!
vision - even in that most sacred function of the prophet to declare God’s will revealed to them.
judgment - The priests had the administration of the law committed to them (Deu 17:9; Deu 19:17). It was against the law for the priests to take wine before entering the tabernacle (Lev 10:9; Eze 44:21).