Joel 2:30-32

30I will produce portents both in the sky and on the earth – blood, fire, and columns of smoke.

31The sunlight will be turned to darkness and the moon to the color of blood, before the day of the Lord comes – that great and terrible day!

32It will so happen that everyone who calls on the name of the Lord will be delivered. For on Mount Zion and in Jerusalem there will be those who survive, just as the Lord has promised; the remnant will be those whom the Lord will call.