Sahih al-Bukhari 431

It is related that 'Abdullah (ibn 'Umar) reported that in the time of the Messenger of Allah, may Allah bless him and grant him peace, the mosque was built of unfired bricks. Its roof was made of palm fronds and its pillars were the trunks of palm-trees. Abu Bakr did not add anything to it. 'Umar added to it, building in the same way that had been employed in the time of the Messenger of Allah, may Allah bless him and grant him peace - using unburnt bricks and palm-branches - but replacing its pillars with wooden ones. Then 'Uthman changed it and enlarged it a great deal, building its walls of engraved stone and plaster and giving it pillars of engraved stone and a roof of teak. XXX: Cooperating in the building of the mosque "It is not for the idolaters to frequent Allah's mosques, bearing witness against themselves of their unbelief. They are the ones whose actions come to nothing. They will be in the Fire timelessly, forever. The mosques of Allah are only frequented by those who believe in Allah and the Last Day and establish the prayer and pay zakat, and fear no one but Allah. They are the people most likely to be guided." (9:17-18)