Sahih al-Bukhari, Book 3, Hadith 73 (In-Book) ⓘ

Narrated `Abdullah bin `Umar: Once Allah's Messenger 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 shy (to answer). The others asked, "O Allah's Apostle! inform us of it." He replied, "it is the date-palm tree." I told my father what had come to my mind and on that he said, "Had you said it I would have preferred it to such and such a thing that I might possess."

حَدَّثَنَا إِسْمَاعِيلُ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ إِنَّ مِنَ الشَّجَرِ شَجَرَةً لاَ يَسْقُطُ وَرَقُهَا، وَهِيَ مَثَلُ الْمُسْلِمِ، حَدِّثُونِي مَا هِيَ ‏"‏‏.‏ فَوَقَعَ النَّاسُ فِي شَجَرِ الْبَادِيَةِ، وَوَقَعَ فِي نَفْسِي أَنَّهَا النَّخْلَةُ‏.‏ قَالَ عَبْدُ اللَّهِ فَاسْتَحْيَيْتُ‏.‏ فَقَالُوا يَا رَسُولَ اللَّهِ، أَخْبِرْنَا بِهَا‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ هِيَ النَّخْلَةُ ‏"‏‏.‏ قَالَ عَبْدُ اللَّهِ فَحَدَّثْتُ أَبِي بِمَا وَقَعَ فِي نَفْسِي فَقَالَ لأَنْ تَكُونَ قُلْتَهَا أَحَبُّ إِلَىَّ مِنْ أَنْ يَكُونَ لِي كَذَا وَكَذَا‏.‏