What were the building materials used to construct the mosque during the lifetime of the Prophet Muhammad (saw)?
 Narrated `Abdullah bin `Umar:                     In the lifetime of Allah's Apostle the mosque was built of adobes, its roof of the leaves of date-palms and its pillars of the stems of date-palms. Abu Bakr did not alter it. `Umar expanded it on the same pattern as it was in the lifetime of Allah's Apostle by using adobes, leaves of date-palms and changing the pillars into wooden ones. `Uthman changed it by expanding it to a great extent and built its walls with engraved stones and lime and made its pillars of engraved stones and its roof of teak wood.