From Sahih Bukhari (Hadith 3862):
Narrated Qais:I heard Sa`id bin Zaid bin `Amr bin Nufail saying in the mosque of Al-Kufa. "By Allah, I have seen myself tied and forced by `Umar to leave Islam before `Umar himself embraced Islam. And if the mountain of Uhud could move from its place for the evil which you people have done to `Uthman, then it would have the right to move from its place
Reference: Bukhari 3862