Joel 2:10-12 New Revised Standard Version (NRSV)
10 The earth quakes before them,
the heavens tremble.
The sun and the moon are darkened,
and the stars withdraw their shining.
11 The Lord utters his voice
at the head of his army;
how vast is his host!
Numberless are those who obey his command.
Truly the day of the Lord is great;
terrible indeed—who can endure it?
12 Yet even now, says the Lord,
return to me with all your heart,
with fasting, with weeping, and with mourning;