Mujahid reported,

I accompanied Ibn Umar to Medina, and the only hadith I heard him narrate from the Prophet ﷺ was this.He said, "We were with the Prophet ﷺ when he was brought the heart of a palm tree. He said, 'Among trees there is a tree whose likeness is that of the Muslim man.' I wanted to say, 'It is the date palm,' but I looked around and saw that I was the youngest of the group, so I kept silent. Then the Messenger of Allah ﷺ said, 'It is the date palm.'"

حدثنا سفيان عن ابن أبي نجيح

عن مجاهد قال

صحبت ابن عمر إلى المدينة فلم أسمعه يحدث عن النبي ﷺ إلا حديثا كنا عند النبي ﷺ فأتي بجمارة فقال إن من الشجر شجرة مثلها كمثل الرجل المسلم فأردت أن أقول هي النخلة فنظرت فإذا أنا أصغر القوم فسكت فقال رسول الله ﷺ هي النخلة