question #3 Sahih al-Bukhari 7277, Book 96, Hadith 10 : What are the implications of introducing new practices into the religion according to Islamic teachings?

The best talk (speech) is Allah’s Book ‘Qur’an), and the best way is the way of Muhammad, and the
worst matters are the heresies (those new things which are introduced into the religion); and whatever
you have been promised will surely come to pass, and you cannot escape (it).