Joel 2:14

11 And the LORD will utter his voice before his army: for his camp [is] very great: for [he is] strong that executeth his word: for the day of the LORD [is] great and very terrible; and who can abide it?

12 Therefore also now, saith the LORD, Turn ye even to me with all your heart, and with fasting, and with weeping, and with mourning:

13 And rend your heart, and not your garments, and turn to the LORD your God: for he [is] gracious and merciful, slow to anger, and of great kindness, and repenteth of the evil.

14 Who knoweth [if] he will return and repent, and leave a blessing behind him; [even] a meat-offering and a drink-offering to the LORD your God?

15 Blow the trumpet in Zion, sanctify a fast, call a solemn assembly:

16 Gather the people, sanctify the congregation, assemble the elders, gather the children, and those that suck the breasts: let the bridegroom go forth from his chamber, and the bride out of her closet.

17 Let the priests, the ministers of the LORD, weep between the porch and the altar, and let them say, Spare thy people, O LORD, and give not thy heritage to reproach, that the heathen should rule over them: why should they say among the people, Where [is] their God?