Q 4: The Prophet (peace be upon him) said:
I left among you two things, the Book of Allah and my Sunnah, as long as you go by them you will not be mislead.
Is there any means for issuing rulings in Shari`ah (Islamic law) other than these two sources?
All praise be to Allah Alone and peace and blessings be upon His Messenger, his family and Companions.
the rulings of Shari`ah are based upon texts from the Qur'an, the Sunnah of the Messenger of Allah (peace be upon him), consensus of scholars and proper analogical deduction. If a Muslim can not derive the rulings from these sources, then they have to follow whom they deem to be reliable from among the scholars. Allah (Exalted be He) says:
So ask the people of the Scripture, if you do not know.