(5) باب طَرْحِ الإِمَامِ الْمَسْأَلَةَ عَلَى أَصْحَابِهِ لِيَخْتَبِرَ مَا عِنْدَهُمْ مِنَ الْعِلْمِ
Narrated Ibn `Umar:
The Prophet (ﷺ) 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 Messenger (ﷺ)?" He replied, "It is the date-palm tree."
Reference: Sahih al-Bukhari 62
In-book reference: Book 3, Hadith 4
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 3, Hadith 59