Sahih Muslim 4930
صحيح مسلم#4930SahihIt has been reported on the authority of Sahl b. Aba Umama b. Sahl b. Hunaif who learned the tradition from his father who (in turn) learned it from his grandfather-that the Messenger of Allah (ﷺ) said:Who sought martyrdom with sincerity will be ranked by Allah among the martyrs even if he died on his bed. In his version of the tradition Abd Tahir did not mention the words:" with sincerity
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: 33:225