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Bukhari :: Book 1 :: Volume 3 :: Hadith 59

Narrated Ibn 'Umar:

The Prophet 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. The others then asked, "Please inform us what is that tree, O Allah's Apostle?" He replied, "It is the date-palm tree."