Musnad Ahmad 709:1

Ali ibn Abdullah narrated to us, he said: Muhammad ibn Ma'n ibn Muhammad ibn Ma'n ibn Nadlah ibn Amr al-Ghifari al-Madani narrated to me, he said: My grandfather Muhammad ibn Ma'n narrated to me, from his father Ma'n ibn Nadlah, from Nadlah ibn Amr al-Ghifari, that he met the Messenger of Allah, peace and blessings of Allah be upon him, at Maryayn. His (Nadlah's) she-camels came upon him, so he gave the Messenger of Allah, peace and blessings of Allah be upon him, to drink, then he drank the remainder of the vessel, and he became full from it. Then he said: "O Messenger of Allah, I used to drink seven [vessels] and not become full?" He said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, the believer drinks in one intestine, and the disbeliever drinks in seven intestines."