Joel 2:30-32

30I will show portents in the heavens and on the earth, blood and fire and columns of smoke.31The sun shall be turned to darkness, and the moon to blood, before the great and terrible day of the Lord comes.32Then everyone who calls on the name of the Lord shall be saved; for in Mount Zion and in Jerusalem there shall be those who escape, as the Lord has said, and among the survivors shall be those whom the Lord calls.