Ibn Taymiyyah (Rohimahulloh) stated ; Undoubtedly, whoever does NOT
believe that it is obligatory to rule according
to that which Allah has revealed to His
Messenger IS A KAAFIR, and WHOEVER THINKS
it is permissible to rule among people
according to HIS OWN opinions, turning away and not
following which Allah has revealed is
also a KAAFIR…So in matters which are
common to the Ummah as a whole, it is NOT permissible to rule or
judge according to anything EXCEPT the
Quran and Sunnah. No one has the RIGHT
to make the people follow the words of a SCHOLAR
or AMEER, SHAYKH or KING. Whoever
BELIEVES that he can judge between
people according to ANY SUCH thing, and does NOT judge
between them according to the Quran
and Sunnah is a KAAFIR.” [Minhaj as-
Sunnah, 5/130-132].