Sahih al-Bukhari · Hadith 4478

Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))

Narrated Sa`id bin Zaid: Allah's Messenger (ﷺ) said, "The Kam'a (i.e. a kind of edible fungus) is like the Manna (in that it is obtained without effort) and its water is a (medicine) cure for eye trouble