Allah wrote in His Book: "My Mercy overpowers My Anger."

Narrated Abu Huraira (Radhi-Allah-hu 'anhu):

The Messenger of Allah (salAllahu alayhi wa sallam) said:

"When Allah completed the creation, He wrote in His Book which is with Him on His Throne,

"My Mercy overpowers My Anger."

[Sahih Bukhari - Book: 54. Beginning of Creation, Hadith:416] 

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