Ibn Umar reported: The pillars of the mosque of the Prophet صلی اللہ علیہ وسلم during the life time of the Messenger of Allah صلی اللہ علیہ وسلم were made of the trunks of the palm-tree; they covered from the above by twigs of the palm-tree; they decayed during the caliphate of Abu Bakr. He built it afresh with trunks and twigs of the palm-tree. But they again decayed during the caliphate of Uthman. He, therefore, built it with bricks. That survives until today.