Commentaries
50:8-20 The desolation that shall be brought upon Babylon is set forth in a variety of expressions. The cause of this destruction is the wrath of the Lord. Babylon shall be wholly desolated; for she hath sinned against the Lord. Sin makes men a mark for the arrows of God's judgments. The mercy promised to the Israel of God, shall not only accompany, but arise from the destruction of Babylon. These sheep shall be gathered from the deserts, and put again into good pasture. All who return to God and their duty, shall find satisfaction of soul in so doing. Deliverances out of trouble are comforts indeed, when fruits of the forgiveness of sin.
20. The specification of "Israel," as well as Judah, shows the reference is to times yet to come.
iniquity … none—not merely idolatry, which ceased among the Jews ever since the Babylonian captivity, but chiefly their rejection of Messiah. As in a cancelled debt, it shall be as if it had never been; God, for Christ's sake, shall treat them as innocent (Jer 31:34). Without cleansing away of sin, remission of punishment would be neither to the honor of God nor to the highest interests of the elect.
whom I reserve—the elect "remnant" (Isa 1:9). The "residue" (Zec 14:2; 13:8, 9).