مُسْنَدُ أَحْمَدَ
Musnad Ahmad 1634
Musnad of Sa'eed bin Zaid bin 'Amr bin Nufail
It was narrated that Sa"eed bin Zaid said: The Messenger of Allah (ﷺ) came out to us with some truffle in his hand and he said: "Do you know what this is? This is a kind of manna, and its water is a healing for the eyes.”
Musnad Ahmad 1634Sahih (Darussalam) [ al-Bukhari (4478) and Muslim (2049)]