Sahih Muslim 4943
صحيح مسلم#4943SahihAnother version of the tradition narrated on the authority of Suhail thouch a different chain of transmitters contains the additional words:" A drowned person is a martyr
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: 33:238