(34) باب الْمُؤْمِنُ يَأْكُلُ فِي مِعًى وَاحِدٍ وَالْكَافِرُ يَأْكُلُ فِي سَبْعَةِ أَمْعَاءٍ
Abu Huraira reported that Allah's Messenger (ﷺ) invited a non-Muslim. Allah's Messenger (ﷺ) commanded that a goat be milked for him. It was milked and he drank its milk. Then the second one was milked and he drank its milk, and then the other one was milked and he drank its milk. till he drank the milk of seven goats. On the next morning he embraced Islam. And Allah's Messenger (ﷺ) commanded that a goat should be milked for him and he drank its milk and then another was milked but he did not finish it, whereupon Allah's Messenger (ﷺ) said:
A believer drinks In one intestine whereas a non-believer drinks in seven intestines.
Reference: Sahih Muslim 2063
In-book reference: Book 36, Hadith 253
USC-MSA web (English) reference(deprecated numbering scheme): Book 23, Hadith 5120