Joel 2:29-31

New Century Version

²⁹ At that time I will pour out my Spirit
    also on male slaves and female slaves.
³⁰ I will show miracles
    in the sky and on the earth:
    blood, fire, and thick smoke.
³¹ The sun will become dark,
    the moon red as blood,
    before the overwhelming and terrible day of the Lord comes.