Shaikh Rabee [may Allaah preserve him] when he said:

It is obligated on the people of truth to exercise patience and increase in adhering to this religion of truth. Whenever the desires become abundant, it becomes necessary to increase in acquainting [oneself] with the truth and adhering to it, as the Messenger [alayhis salaatu was-salaam] said: The one who lives long amongst you will see a lot of differences, so upon you is that you follow my Sunnah and the Sunnah of the rightly guided khulafaa. Bite onto it with your molar teeth [i.e. hold onto it firmly] and beware of newly invented matters [in the religion], for every newly invented matter [in the religion] is a bidah and every bidah is misguidance.


[Majmoo 14/294 (3rd paragraph)]