A disbelieving guest once stayed with the Messenger of Allah ﷺ, and the Messenger of Allah ﷺ ordered that a sheep be brought for him. It was milked, and he drank its milk. Then another was milked, and he drank that too. Then another, and he drank that as well, until he had drunk the milk of seven sheep.The next morning he became a Muslim, and the Messenger of Allah ﷺ ordered that a sheep be brought for him. It was milked, and he drank its milk. Then the Prophet ordered another for him, but he could not finish it.So the Messenger of Allah ﷺ said, "The believer drinks with one stomach, and the disbeliever drinks with seven stomachs."
و حدثني عن مالك عن سهيل بن أبي صالح عن أبيه
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