Commentaries:
Jamieson, Fausset, and Brown
Drop—namely, the fertilizing rain (Psalms 65:12).
skies—clouds; lower than the "heavens."
righteousness—that is, the dews of the Holy Spirit, whereby "righteousness" shall "spring up." (See latter end of the verse).
earth—figuratively for the hearts of men on it, opened for receiving the truth by the Holy Ghost (Acts 16:14).
them—the earth and the heavens. HORSLEY prefers: "Let the earth open, and let salvation and justice grow forth; let it bring them forth together; I the Lord have created him" (Isaiah 45:13). MAURER translates, "Let all kinds of salvation (prosperity) be fruitful" (Psalms 72:3, Psalms 72:6-7). The revival of religion after the return from Babylon suggests to the prophet the diffusion of Messiah's Gospel, especially in days still future; hence the elevation of the language to a pitch above what is applicable to the state of religion after the return.
Other Jamieson, Fausset, and Brown entries containing Isaiah 45:8:
Isaiah 41:2
Isaiah 45:1
Isaiah 45:9
Isaiah 61:11
Malachi 2:10-16
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