Joel 2:11-13

The LORD gives voice before His army, For His camp is very great; For strong is the One who executes His word. For the day of the LORD is great and very terrible; Who can endure it? “Now, therefore,” says the LORD, “Turn to Me with all your heart, With fasting, with weeping, and with mourning.” So rend your heart, and not your garments; Return to the LORD your God, For He is gracious and merciful, Slow to anger, and of great kindness; And He relents from doing harm.