Musnad Ahmad 103:1

Yahya ibn Sa'id informed us, Al-Mushamma'il narrated to us, he said: 'Amr ibn Sulaym al-Muzani narrated to me, he said: I heard Rafi' ibn 'Amr al-Muzani, he said: I heard the Prophet, may God bless him and grant him peace, while I was a young boy, saying: "The Ajwa [date] and the tree are from Paradise."