ByShaykh Abu ‘l-Hasan ‘Ali al-Nadwi
The body of Din which has reached us can be divided into two kinds. One kind is that which has reached us in a particular state and form; it is called mansus bi’l wada‘ (laid down in writing by the Lawgiver), and is desired and required in the same state and form. In other words, these are the affairs of al-Din, which have reached us through authentic historical records in a particular state and form, such as the pillars of Din and many obligatory duties which the Prophet Muhammad (may Allah bless him and grant him peace) not only examined verbally but also demonstrated in their physical forms by his own practice, i.e., prayer, fasting, pilgrimage, ablution, etc.