17. line—the measuring-line of the plummet. HORSLEY translates, "I will appoint judgment for the rule, and justice for the plummet." As the corner-stone stands most perpendicular and exactly proportioned, so Jehovah, while holding out grace to believers in the Foundation-stone, will judge the scoffers (Isa 28:15) according to the exact justice of the law (compare Jas 2:13).