And Muhammad ibn al-Muthanna narrated to us, Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, from 'Abd al-Malik ibn 'Umayr, who said: I heard 'Amr ibn Hurayth say: I heard Sa'id ibn Zayd say: I heard the Messenger of Allah, peace and blessings be upon him, say: "The truffle is from manna, and its water is a cure for the eye."