Grievous revolters; obstinate and refractory, Isa_31:6Jer_5:3,23.
Walking with slanders; being their main business to detract from thee and the other prophets, Jer_18:18 20:10; a sin expressly forbidden, Lev_19:16.
They are brass and iron: this to the end of the chapter is all metaphorical; either they are impudent, as brass doth sometimes signify, or they are obstinate and inflexible, as iron notes: see both Isa_48:4: or it signifies their corrupt estate; they are not pure metal, as silver or gold, but base and mean, as brass and iron mixed together, Eze_22:18.
They are all corrupters: this relates to their manners; they propagate their corruption, Isa_1:4; they strengthen one another in wickedness.