51:4-8 The gospel of Christ shall be preached and published. How shall we escape if we neglect it? There is no salvation without righteousness. The soul shall, as to this world, vanish like smoke, and the body be thrown by like a worn-out garment. But those whose happiness is in Christ's righteousness and salvation, will have the comfort of it when time and days shall be no more. Clouds darken the sun, but do not stop its course. The believer will enjoy his portion, while revilers of Christ are in darkness
4. my people—the Jews. This reading is better than that of Gesenius: "O peoples … nations," namely, the Gentiles. The Jews are called on to hear and rejoice in the extension of the true religion to the nations; for, at the first preaching of the Gospel, as in the final age to come, it was from Jerusalem that the gospel law was, and is, to go forth (Isa 2:3).
law … judgment—the gospel dispensation and institutions (Isa 42:1, "judgment").
make … to rest—establish firmly; found.
light, &c.—(Isa 42:6).