A disbeliever once came as a guest to the Messenger of Allah ﷺ. The Messenger of Allah ﷺ ordered that a sheep be milked for him, and he drank its milk. Then another was milked, and he drank that as well. Then another, and he drank it too, until he had drunk the milk of seven sheep.The next morning he embraced Islam. The Messenger of Allah ﷺ ordered that a sheep be milked for him, and he drank its milk. Then another was ordered for him, but he could not finish it.The Messenger of Allah ﷺ said, "The believer drinks in one intestine, while the disbeliever drinks in seven intestines."
أن رسول الله ﷺ ضافه ضيف كافر، فأمر له رسول الله ﷺ بشاة فحلبت، فشرب حلابها، ثم أخرى فشربه، ثم أخرى فشربه، حتى شرب حلاب سبع شياه، ثم إنه أصبح فأسلم، فأمر له رسول الله ﷺ بشاة فحلبت، فشرب حلابها، ثم أمر له بأخرى فلم يستتمها، فقال رسول الله ﷺ: المؤمن يشرب في معى واحد، والكافر يشرب في سبعة أمعاء.
Malik narrated it in the Description of the Prophet ﷺ (10), from Suhayl bin Abu Salih, from his father, from Abu Hurairah, and he mentioned it. Muslim also narrated it in the Book of Drinks (2063), through the route of Malik, with the same wording.