From Sahih Muslim (Hadith 7100):
Mujahid said:(I have had the privilege) of accompanying Ibn 'Umar up to Medina but I did not hear him narrate anything from Allah's Messenger (ﷺ) except one hadith. And he said: We were in the presence of Allah's Messenger (ﷺ) that there was brought to him the kernel of a date. The rest of the hadith is the same
Reference: Muslim 7100