Charles Ellicott Commentary Isaiah 51:7

"Hearken unto me, ye that know righteousness, the people in whose heart is my law; fear ye not the reproach of men, neither be ye dismayed at their revilings." — Isaiah 51:7 (ASV)

Ye that know righteousness. —Jehovah, through His Servant, speaks to the Israel within Israel, the Church within the Church. They need support against the scorn and reproach of men, and are to find it in the thought that the revilers perish and that Jehovah is eternal.