In six cases in Quran, mention is made of the forbidden tree, but it does not say what the fruit really was. In some Islamic traditions wheat is said to have been it; and some other narrations comment it to have been the tree of JEALOUSY, in a figurative language. In the canonical Bible it is cited that it was the tree of knowledge - the knowledge of good and bad. * * * * * (The incident of Adam and Eve has been narrated in the canonical Bible as under mentioned:WHAT WAS THE FORBIDDEN TREE?