Sahih Muslim 6768
صحيح مسلم#6768SahihA'isha, the mother of the believers, reported that a child died and I said:There is happiness for this child who is a bird from amongst the birds of Paradise. Thereupon Allah's Messenger (ﷺ) said: Don't you know that Allah created the Paradise and He created the Hell and He created the dwellers for this (Paradise) and the denizens for this (Hell)?
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: 46:46