Sahih Muslim 350
صحيح مسلم#350SahihYazid b. al-Asamm said:I heard Abu Huraira saying that the Messenger of Allah (ﷺ) observed: people will certainly ask you about everything till they will propound: Allah created every thing, but who created Allah?
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: 1:257