Sahih Muslim 490
صحيح مسلم#490SahihAmr b. Abu Sufyan reported:Abu Huraira said to Ka'b al-Ahbar that the Messenger of Allah (ﷺ) had said: For every apostle there Is a (special) prayer by which he would pray (to his Lord). I, however, intend (if Allah so willed) that I would reserve my prayer for the intercession of my Ummah on the Day of Resurrection. Ka'b said to Abu Huraira: Did you hear this from the Messenger of Allah (ﷺ)? Abu Huraira said: Yes
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: 1:396