It is narrated from Sayyiduna Ma'n bin Nadlah (may Allah be pleased with him) that Sayyiduna Nadlah (may Allah be pleased with him) met the Messenger of Allah (peace and blessings be upon him) at Murrayn, and he had his milch she-camels with him. He milked (one) for the Messenger of Allah (peace and blessings be upon him) into a vessel, and the Messenger of Allah (peace and blessings be upon him) drank it. Then he himself drank only one vessel and said: "O Messenger of Allah! By the One who sent you with the truth, I used to drink seven vessels (before) and yet my stomach would not be full, nor would I be satisfied." The Messenger of Allah (peace and blessings be upon him) said: "Indeed, the believer drinks into one intestine, and the disbeliever drinks into seven intestines."
Hadith Referenceمسند أبي يعلى الموصلي / مسند معن بن نضلة / 1584