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 (ﷺ) 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 (ﷺ) ." Then he pointed out with his hand and said,
"And that is his daughter's (house) which you can see."
Sahih al-Bukhari Book 65, Hadith 172