20. Go out of Babylon. This is the second clause of this remonstrance, in which the Lord solemnly declares that he will be the Redeemer of his people, though they have been unworthy and ungrateful. After having declared that he performed the office of a good teacher, but that the people refused to hearken to him, so that by their own fault they drew down on themselves the punishment of captivity, he now declares his unwearied forbearance, by adding that he will still assist them, in order to bring them out of slavery. He therefore commands them to go out of the land of Babylon, in which they were captives. Hence we see that God, in his unspeakable goodness, though he has just cause to remonstrate with us, yet relieves our afflictions, and assists those who had been unworthy, and even who had insolently rejected his grace.
With the voice ofrejoicing. This relates to the confirmation of the deliverance, for he intended to give assurance to a promise which was altogether incredible. In order, therefore, to remove all doubt, he employed lofty language in extolling this blessing.
Tell it. He describes the strength of that confidence by which he wished to encourage the Jews; for we are wont to utter loudly and boldly those things of which we are certain, and, if we have any doubt, we scarcely venture to speak, and are dumb. Isaiah speaks of a future event as if it had actually arrived, that the people might cherish in their hearts greater and stronger confidence He makes use of the imperative mood, which is much more forcible, and produces a more powerful impression on our minds, than if he had expressed his meaning in plain terms.