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”).