Joel 2:30-32

30I will show signs and wonders [displaying My power] in the heavens and on the earth, Blood and fire and columns of smoke.

31The sun will be turned into darkness And the moon into blood Before the great and terrible day of the Lord comes.

32And it shall come about that whoever calls on the name of the Lord Will be saved [from the coming judgment] For on Mount Zion and in Jerusalem There will be those who escape, As the Lord has said, Even among the remnant [of survivors] whom the Lord calls.