In the story, the young Ibn Umar worked it out but was too shy to speak in front of his elders, so the Prophet gave the answer himself.
There is a kind of tree that doesn’t lose its leaves, and it is like a Muslim. Tell me what it is.
Give me a hintThe hint
An evergreen of the desert, and its fruit often breaks the Ramadan fast.
Reveal the answerHide the answer
The date palm
Source: A hadith of the Prophet Muhammad told by Ibn Umar, Sahih al-Bukhari, 9th century