Hadith #4363 (Sahih Muslim)
Book: The Book of Judicial Decisions
Narrator(s): Sa'd bin Ibrahim سعد بن إبراهيم بن عبد الرحمن
Grade: Sahih

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.

Source: https://parallelquran.com/hadith/sahih-muslim-4363/