'A'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.
Sa'd b. Ibrahim reported
I asked Qasim b. Muhammad about a person who had three dwelling houses and he willed away the third part of every one of these houses; he (Qasim b. Muhammad) said: All of them could be combined in one house; and then said: 'A'isha informed me that Allah's Messenger (ﷺ) said: He who did any act for which there is no sanction from our behalf, that is to be rejected.