Joel 2:29-32

In those days I will pour out my Spirit even on servants—men and women alike. And I will cause wonders in the heavens and on the earth— blood and fire and columns of smoke. The sun will become dark, and the moon will turn blood red before that great and terrible day of the LORD arrives. But everyone who calls on the name of the LORD will be saved, for some on Mount Zion in Jerusalem will escape, just as the LORD has said. These will be among the survivors whom the LORD has called.