The evidence is His saying:

And (commanding you): "Seek the forgiveness of your Lord, and turn to Him in repentance that He may grant you good enjoyment for a term appointed and bestow His abounding grace to every owner of grace. But if you turn away, then I fear for you the torment of a great day. ^[1]

And also His saying upon the tongue of Hūd (ʿalayhis salām):

"And O my people! Ask forgiveness of your Lord and then repent to Him, He will send you (from the sky) abundant rain, and add strength to your strength, so do not turn away as criminals, wrongdoers." ^[2]

From the fruits of repentance are good enjoyment in this world, receiving increase in bounty and excellence from Allāh and sending of rain and providence from the sky.

Repentance has a number of conditions for it to be accepted and they are:

• Acknowledging that sin has been committed
• Remorse for falling into the sin
• Resolving not to return to the sin
• Rectifying any harm if it involved the rights of others
• Asking for forgiveness for this sin
• Having firm belief that Allāh is the Forgiver of sins

Footnotes