Sahih Muslim 5345
صحيح مسلم#5345SahihSa'id b. Zaid b. 'Amr b. Nufail reported Allah's Messenger (ﷺ) as saying:Truffles are a kind of 'Manna' which Allah the Glorious and Exalted, sent down upon the people of Israil, and its 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: 36:219