Commentaries
66:5-14 The prophet turns to those that trembled at God's word, to comfort and encourage them. The Lord will appear, to the joy of the humble believer, and to the confusion of hypocrites and persecutors. When the Spirit was poured out, and the gospel went forth from Zion, multitudes were converted in a little time. The word of God, especially his promises, and ordinances, are the consolations of the church. The true happiness of all Christians is increased by every convert brought to Christ. The gospel brings with it, wherever it is received in its power, such a river of peace, as will carry us to the ocean of boundless and endless bliss. Divine comforts reach the inward man; the joy of the Lord will be the strength of the believer. Both God's mercy and justice shall be manifested, and for ever magnified.
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).