Joel - Chapter 3
Hey, Who Turned Out The Lights?
In the future, in Messianic times, G-d will pour His spirit out on the people, who will be so infused with an understanding of G-d that many will have dreams and visions. Even the members of other nations, who may choose to come to Israel to facilitate the service of G-d, will be on a high spiritual level.
Prior to that, at the war of Gog and Magog, G-d will send signs in the form of blood, fire and pillars of smoke. (This verse may be familiar from the Passover Haggadah.) The sun will darken and the moon will go red, as an ill omen for idolators who worship Heavenly bodies. Whoever calls out to G-d will be saved; there will be sanctuary in Jerusalem and on the Temple mount. This was foretold in Deuteronomy 28:10, that everyone would see that this nation is called by G-d's Name.