‏الأشربة : Hadeeth No:5089 Sa'id b. Zaid reported Allaah's Messenger (sallAllaahu alayhi wa sallam) as saying: Truffles are 'Manna' and its juice is the medicine for the eyes....

‏الجنة وصفة نعيمها وأهلها‏ : Hadeeth No:6834 This hadith has been narrated on the authority of Shu'ba with the same chain of transmitters but with a slight variation of wording....