Narrated ibn Omar (r.a), The Prophet (s.a.w) said, “Amongst the trees, there is a tree, the leaves of which do not fall and is like a Muslim.Tell me the name of that tree.” Everybody started thinking about the trees of the desert areas. And I thought of the date-palm tree but felt too shy to answer.The others then asked, “What is that tree, O Allah’s Apostle?” He replied, “It is the date-palm tree.” Sahih Bukhari, Book of Knowledge, Hadith #58.