What did Sa'id bin Zaid witness regarding 'Umar's relationship with Islam (peace be upon him) before embracing it?
 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)