Joel 2:28-32  NAS          

It will come about after this that I will pour out My Spirit on all mankind; and your sons and daughters will prophesy, your old men will dream dreams, your young men will see visions.  Even on the male and female servants I will pour out My Spirit in those days.

I will display wonders in the sky and on the earth, blood, fire and columns of smoke.  The sun will be turned into darkness and the moon into blood before the great and awesome day of the Lord comes.  And it will come about that whoever call on the name of the Lord will be delivered; for on Mount Zion and in Jerusalem there will be those who escape, as the Lord has said, even among the survivors whom the Lord calls.