Joel 2:11-15

2:11 And the LORD shall 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? 2:12 Therefore also now, saith the LORD, turn ye [even] to me with all your heart, and with fasting, and with weeping, and with mourning: 2:13 And rend your heart, and not your garments, and turn unto the LORD your God: for he [is] gracious and merciful, slow to anger, and of great kindness, and repenteth him of the evil. 2:14 Who knoweth [if] he will return and repent, and leave a blessing behind him; [even] a meat offering and a drink offering unto the LORD your God? 2:15 Blow the trumpet in Zion, sanctify a fast, call a solemn assembly: