Yahya related to me from Malik from Suhayl ibn Abi Salih from hisfather from Abu Hurayra that the Messenger of Allah, may Allah blesshim and grant him peace, gave hospitality to a kafir guest. TheMessenger of Allah, may Allah bless him and grant him peace, ordered asheep to be brought for him and it was milked. He drank its milk. Thenanother came, and he drank it. Then another came and he drank it untilhe had drunk the milk of seven sheep. In the morning he became muslim,and the Messenger of Allah, may Allah bless him and grant him peace,ordered a sheep for him. It was milked and he drank its milk. Then heordered another for him and he could not finish it. The Messenger ofAllah, may Allah bless him and grant him peace, said, "The mumindrinks in one intestine, and the kafir drinks in seven intestines."
USC-MSA web (English) reference: Book 49, Hadith 10
Arabic reference: Book 49, Hadith 1683