Saeed bin Zayd reported,

I heard the Prophet ﷺ say, "Truffles are a form of manna, and their juice is a cure for the eye."

Azami 12340

Sahih

عن سعيد بن زيد بن عمرو بن نفيل قال

سمعت النبي ﷺ يقول: الكمأة من المن، وماؤها شفاء للعين.

الأعظمي 12340صحيح
Contents
Reference
Commentary
Ayat
Collection
Jami al-Kamil
Book
Tafsir of the great Quran
Chapter
Virtues of Surah Baqarah
Section
His saying, "And We divided them into twelve tribes as nations. And We revealed to Musa when his people asked him for water, 'Strike the rock with your staff,' and there gushed forth from it twelve springs. Each people knew its drinking place. And We shaded them with clouds and sent down upon them manna and quails, 'Eat from the good things We have provided for you.' And they did not wrong Us, but they used to wrong themselves."
Numbering
Jami al-Kamil 12340 (2nd edition)