Islam has given two reliable pathways for the guidance of mankind. One of them is the clear Verses of Qur’an while the other, quite consistent with the first, is what we call Sunnah or hadith.
To explain and interpret its basic and brief teachings, Qur’an has itself mentioned the need for Sunnah and the Prophet’s model lifestyle. The latter explains the former.

The Sunnah is an indispensable guide to understand the commandments and passages of Qur’an. Without hadith, the entire faith and the entire Shariah (Islamic Law) will become no better than a riddle. It is to be noted that the wealth of expository material relating to Sharia, as found in Azadi, was also given to the Prophet by Allah through the archangel Gabriel (Jibril).