The Messenger of Allah ﷺ said, "Among the trees there is one whose leaves do not fall, and it is like the believer. Tell me what it is."Abdullah said, "The people began thinking of the trees of the desert. It occurred to me that it was the date palm, but I felt too shy to speak."Then the Prophet ﷺ said, "It is the date palm."Abdullah said, "I later told Umar what had crossed my mind, and he said, 'For you to have said it would have been dearer to me than such and such.'"
حدثنا إسحق بن موسى الأنصاري حدثنا معن حدثنا مالك عن عبد الله بن دينار
أن رسول الله ﷺ قال إن من الشجر شجرة لا يسقط ورقها وهي مثل المؤمن حدثوني ما هي قال عبد الله فوقع الناس في شجر البوادي ووقع في نفسي أنها النخلة فقال النبي ﷺ هي النخلة فاستحييت أن أقول قال عبد الله فحدثت عمر بالذي وقع في نفسي فقال لأن تكون قلتها أحب إلي من أن يكون لي كذا وكذا
Agreed upon [by Bukhari and Muslim]. Bukhari narrated it in "Knowledge," chapter on modesty in knowledge, no. 131, from a hadith, and Muslim, no. 2811, from a hadith of Abdullah bin Dinar, through him.On this subject there is also a report from Abu Hurairah, [narrated by] Malik [previously mentioned: 2866].