Sahih Muslim 5348
صحيح مسلم#5348SahihSa'id b. Zaid reported Allah's Messenger (ﷺ) as saying:Truffles are 'Manna' and its juice is the medicine for the eyes
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: 36:222