Ali ibn Ibrahim from his father from Abdullah ibn al-Mughirah from Abdullah ibn Sinan from Abu Abdillah عليه السلام, peace be upon him, who said: I heard Imam al-Sadiq عليه السلام say: “Indeed, the Messenger of Allah سبحانه وتعالى, peace be upon him and his family, built his mosque with samit (a type of simple material), then the Muslims increased in number, so they said: ‘O’ Messenger of Allah سبحانه وتعالى, if only you would command the mosque to be expanded’. Prophet صلى الله عليه وعلى آله وسلم said: “Yes.” So Prophet صلى الله عليه وعلى آله وسلم commanded it, and it was expanded, and He صلى الله عليه وعلى آله وسلم built it with sa'idah (palm trunks or branches). Then the Muslims increased again, so they said: ‘O’ Messenger of Allah سبحانه وتعالى, if only you would command the mosque to be expanded’. Prophet صلى الله عليه وعلى آله وسلم said: “Yes.” So Prophet صلى الله عليه وعلى آله وسلم commanded it, and it was expanded, and its wall was built with ‘al-Untha’ and ‘al-Dhakar’ (with clay bricks called 'female' and 'male'). Then the heat became intense for them, so they said: ‘O’ Messenger of Allah سبحانه وتعالى, if only you would command the mosque to be shaded’. Prophet صلى الله عليه وعلى آله وسلم said: “Yes.” So Prophet صلى الله عليه وعلى آله وسلم commanded it, and pillars were erected in it from palm trunks, then crossbeams and palm leaves and al-idhkhar (a fragrant desert grass) were placed over them. And they remained in it until rain struck them, and the mosque began to drip on them. So they said: ‘O’ Messenger of Allah سبحانه وتعالى, if only you would command the mosque to be plastered with clay’. The Messenger of Allah سبحانه وتعالى, peace be upon him and his family, said to them: “No. A canopy like the canopy of Musa عليه السلام, peace be upon him.” And it remained like that until the Messenger of Allah سبحانه وتعالى, peace be upon him and his family, passed away. Its wall, before it was shaded, was (equivalent to) a man’s height. And when the shadow (al-fay’) reached one cubit, which is the space of a goat’s resting place, He صلى الله عليه وعلى آله وسلم would pray the noon prayer (al-Dhuhr). And when it became double that, He صلى الله عليه وعلى آله وسلم would pray the afternoon prayer (al-Asr).” And Imam عليه السلام said: “ ‘As-samit’ is one brick by one brick, ‘As-sa‘idah’ is one and a half bricks, and ‘Al-untha’ and ‘Al-dhakar’ are two differing bricks.”