Sahih Muslim 4492
صحيح مسلم#4492SahihA'isha reported Allah's Messenger (ﷺ) as saying:He who innovates things in our affairs for which there is no valid (reason) (commits sin) and these are to be rejected
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 30:23