Narrated Ibn `Umar: That a man came to him (while two groups of Muslims were fighting) and said, O Abu `Abdur Rahman! Don't you hear what Allah has mentioned in His Book: 'And if two groups of believers fight against each other...' (49.9) So what prevents you from fighting as Allah has mentioned in His Book? ' Ibn `Umar said, O son of my brother! I would rather be blamed for not fighting because of this Verse than to be blamed because of another Verse where Allah says: 'And whoever kills a believer intentionally... (4.93) Then that man said, Allah says:-- 'And fight them until there is no more afflictions (worshipping other besides Allah) and the religion (i.e. worship) will be all for Allah (Alone) (8.39) Ibn `Umar said, We did this during the lifetime of Allah's Messenger when the number of Muslims was small, and a man was put to trial because of his religion, the pagans would either kill or chain him; but when the Muslims increased (and Islam spread), there was no persecution. When that man saw that Ibn `Umar did not agree to his proposal, he said, What is your opinion regarding `Ali and `Uthman? Ibn `Umar said, What is my opinion regarding `Ali and `Uthman? As for `Uthman, Allah forgave him and you disliked to forgive him, and `Ali is the cousin and son-in-law of Allah's Messenger . Then he pointed out with his hand and said, And that is his daughter's (house) which you can see.