Sahih Muslim 6934
صحيح مسلم#6934SahihAbu Huraira reported that Allah's Messenger (ﷺ) said:The supplication of every one of you is granted if he does not grow impatient and says: I supplicated but it was not granted
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: 48:125