Sahih Muslim 5342
صحيح مسلم#5342SahihSa'id b. Zaid b. 'Amr b. Nufail reported:I heard Allah's Apostle (ﷺ) as saying: Truffles are a kind of 'Manna' and their juice is a 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: 36:216