Joel 2:31-32

New Revised Standard Version, Anglicised Catholic Edition

³¹ The sun shall be turned to darkness, and the moon to blood, before the great and terrible day of the Lord comes. ³² Then 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.