(V.2:57) Mujâhid said, "Al-Manna is a kind of sweet gum, and As-Salwâ, a kind of bird (i.e. quails)"...Narrated Sa‘îd Ibn Zaid رضي الله عنه: Allâh’s Messenger صلى الله عليه وسلم said, "The Kam’a (truffle i.e. a kind of edible fungus) is like the Manna (as it is obtained without any effort) and its water is a (medicine) cure for eye trouble." (Sahih Al-Bukhâri, Vol.6, Hadîth No.5). (S.B. 1714)