Literally translated as Holding Fast (to the Sunnah) , the two volumes
(in one book) go into detail on important topics such as bid’ah, as well
as clarifying actions and spontaneous actions.
Al-i'tisam is one of the earliest if not the first book to be compiled
about Bid'a. Imam al-Shatibi's strict analysis and complete adherence to
the verification of all sciences makes him one of the unique individuals
capable of determining what is Bid'a in the Islamic science.