isaiah 66:5 Hear the word of the LORD, ye that tremble at his word; Your brethren that hated you, that cast you out for my name's sake, said, Let the LORD be glorified: but he shall appear to your joy, and they shall be ashamed. - Free Bible Online

      5. tremble at . . . word--the same persons as in Isa 66:2, the believing few among the Jews.
      cast you out for my name's sake--excommunicate, as if too polluted to worship with them (Isa 65:5). So in Christ's first sojourn on earth (Mt 10:22; Joh 9:22, 34; 16:2; 15:21). So it shall be again in the last times, when the believing shall be few (Lu 18:8).
      Let the Lord be glorified--the mocking challenge of the persecutors, as if their violence towards you was from zeal for God. "Let the Lord show Himself glorious," namely, by manifesting Himself in your behalf; as the parallelism to, "He shall appear to your joy," requires (as in Isa 5:19; compare Isa 28:15; 57:4). So again Christ on the cross (Mt 27:42, 43).
      appear to your joy--giving you "joy" instead of your "rebuke" (Isa 25:8, 9).

JFB.