Narrated to us Ibn Abi 'Umar: narrated to us Sufyan, from 'Abd al-Malik ibn 'Umayr, who said: I heard 'Amr ibn Hurayth saying: I heard Sa'id ibn Zayd saying: The Messenger of Allah, peace and blessings be upon him, said: "The truffle is from the manna which Allah, Mighty and Majestic, sent down upon the Children of Israel, and its water is a cure for the eye."