isaiah 45:8 Drop down, ye heavens, from above, and let the skies pour down righteousness: let the earth open, and let them bring forth salvation, and let righteousness spring up together; I the LORD have created it. - Free Bible Online

      8. Drop--namely, the fertilizing rain (Ps 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 (Ac 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" (Isa 45:13). MAURER translates, "Let all kinds of salvation (prosperity) be fruitful" (Ps 72:3, 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.

JFB.