Adam Clarke on Psalms 58:1

Do ye indeed speak righteousness - Or, O cabinet seeing ye profess to act according to the principles of justice, why do ye not give righteous counsels and just decisions, ye sons of men? Or, it may be an irony: What excellent judges you are! well do ye judge according to law and justice, when ye give decisions not founded on any law, nor supported by any principle of justice! To please your master, ye pervert judgment; and take part against the innocent, in order to retain your places and their emoluments. Saul's counsellors appear to have done so, though in their consciences they must have been satisfied of David's innocence.