Musnad Ahmad 30:3224

Abdullah ibn Bakr al-Sahmi narrated to us, he said: Sa'id ibn Abi 'Aruba narrated to us, from Qatadah, from Shahr ibn Hawshab, from Abu Hurairah, that the Messenger of Allah, peace and blessings of Allah be upon him, said: "The Ajwa date is from Paradise, and it is a cure for poison. And the truffle is from the Manna, and its water is a cure for the eye."