Sahih Bukhari Volume 7, Book 70, Hadith 5446

حَدَّثَنَا عُمَرُ بْنُ حَفْصِ بْنِ غِيَاثٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا الأَعْمَشُ، قَالَ حَدَّثَنِي مُجَاهِدٌ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ بَيْنَا نَحْنُ عِنْدَ النَّبِيِّ صلى الله عليه وسلم جُلُوسٌ إِذْ أُتِيَ بِجُمَّارِ نَخْلَةٍ فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ إِنَّ مِنَ الشَّجَرِ لَمَا بَرَكَتُهُ كَبَرَكَةِ الْمُسْلِمِ ‏"‏‏.‏ فَظَنَنْتُ أَنَّهُ يَعْنِي النَّخْلَةَ، فَأَرَدْتُ أَنْ أَقُولَ هِيَ النَّخْلَةُ يَا رَسُولَ اللَّهِ‏.‏ ثُمَّ الْتَفَتُّ فَإِذَا أَنَا عَاشِرُ عَشَرَةٍ أَنَا أَحْدَثُهُمْ فَسَكَتُّ، فَقَالَ النَّبِيُّ صلى الله عليه وسلم ‏"‏ هِيَ النَّخْلَةُ ‏"

Narrated By 'Abdullah bin Umar : While we were sitting with the Prophet a spadix of palm tree was brought to him. The Prophet said, "There is a tree among the trees which is as blessed as a Muslim" I thought that it was the date palm tree and intended to say, "It is the date-palm tree, O Allah's Apostle!" but I looked behind to see that I was the tenth and youngest of ten men present there, so I kept quiet' Then the Prophet said, "It is the date-palm tree."