Charles Ellicott Commentary Isaiah 51:4

"Attend unto me, O my people; and give ear unto me, O my nation: for a law shall go forth from me, and I will establish my justice for a light of the peoples." — Isaiah 51:4 (ASV)

A law shall proceed. — “Law” and “judgment” include all forms of divine revelation, and especially the “glad tidings” which are the groundwork of the highest law (Romans 1:17).