(1) باب مَنِ اخْتَارَ الضَّرْبَ وَالْقَتْلَ وَالْهَوَانَ عَلَى الْكُفْرِ
Narrated Qais:
I heard Sa`id bin Zaid saying, "I have seen myself tied and forced by `Umar to leave Islam (Before `Umar himself embraced Islam). And if the mountain of Uhud were to collapse for the evil which you people had done to `Uthman, then Uhud would have the right to do so." (See Hadith No. 202, Vol. 5)
Reference: Sahih al-Bukhari 6942
In-book reference: Book 89, Hadith 3
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 85, Hadith 75