Musnad Ahmad 819:1

Yahya ibn Sa'id narrated to us, Al-Musham'al narrated to us, 'Amr ibn Sulaym al-Muzani narrated to me, that he heard Rafi' ibn 'Amr al-Muzani say: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying—and I was a young boy—saying: "The Ajwa (date) and the tree are from Paradise."