Sahih Muslim 2811 a
'Abdullah b. Umar reported that Allah's Messenger (ﷺ) said:
There is a tree amongst trees, the leaves of which do not wither and that is like a Muslim; tell me which that (tree) can be? The people began to think of the trees of the forest. Abdullah said: I thought that it could be the date-palm tree, but I felt hesitant (to say that). They (the Companions) then said: Allah's Messenger, (kindly) tell us which that can be? Thereupon he said: It is the date-palm tree. I made a mention of that to 'Umar, whereupon he said: Had you said that it meant the date-palin tree, this statement of yours (would have been dearer to me) than such and such things.
حَدَّثَنَا يَحْيَى بْنُ أَيُّوبَ، وَقُتَيْبَةُ بْنُ سَعِيدٍ، وَعَلِيُّ بْنُ حُجْرٍ السَّعْدِيُّ، - وَاللَّفْظُ لِيَحْيَى
 - قَالُوا حَدَّثَنَا إِسْمَاعِيلُ، - يَعْنُونَ ابْنَ جَعْفَرٍ - أَخْبَرَنِي عَبْدُ اللَّهِ بْنُ دِينَارٍ، أَنَّهُ سَمِعَ عَبْدَ،
 اللَّهِ بْنَ عُمَرَ يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِنَّ مِنَ الشَّجَرِ شَجَرَةً لاَ يَسْقُطُ
 وَرَقُهَا وَإِنَّهَا مَثَلُ الْمُسْلِمِ فَحَدِّثُونِي مَا هِيَ ‏"‏ ‏.‏ فَوَقَعَ النَّاسُ فِي شَجَرِ الْبَوَادِي ‏.‏ قَالَ
 عَبْدُ اللَّهِ وَوَقَعَ فِي نَفْسِي أَنَّهَا النَّخْلَةُ فَاسْتَحْيَيْتُ ثُمَّ قَالُوا حَدِّثْنَا مَا هِيَ يَا رَسُولَ اللَّهِ
 قَالَ فَقَالَ ‏"‏ هِيَ النَّخْلَةُ ‏"‏ ‏.‏ قَالَ فَذَكَرْتُ ذَلِكَ لِعُمَرَ قَالَ لأَنْ تَكُونَ قُلْتَ هِيَ النَّخْلَةُ أَحَبُّ
 إِلَىَّ مِنْ كَذَا وَكَذَا ‏.‏