Reference: al-I’tisaam v1 p37
رحمه الله mentions:
Linguistically bid’ah (innovation) means ‘a newly invented matter’.
The Sharee’ah definition of bid’ah is: A newly invented way [beliefs or action] in the religion, in imitation of the Sharee’ah (prescribed Law), by which nearness to Allaah is sought, [but] not being supported by any authentic proof – neither in its foundations, nor in the manner in which it is performed.
