Sahih Muslim 2063
Sahih Muslim · Book 36: The Book of Drinks · The believer eats in one intestine and the disbeliever eats in seven intestines.
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:
وَحَدَّثَنِي مُحَمَّدُ بْنُ رَافِعٍ ، حَدَّثَنَا إِسْحَاقُ بْنُ عِيسَى ، أَخْبَرَنَا مَالِكٌ ، عَنْ سُهَيْلِ بْنِ، أَبِي صَالِحٍ عَنْ أَبِيهِ ، عَنْ أَبِي هُرَيْرَةَ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم ضَافَهُ ضَيْفٌ وَهُوَ كَافِرٌ فَأَمَرَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم بِشَاةٍ فَحُلِبَتْ فَشَرِبَ حِلاَبَهَا ثُمَّ أُخْرَى فَشَرِبَهُ ثُمَّ أُخْرَى فَشَرِبَهُ حَتَّى شَرِبَ حِلاَبَ سَبْعِ شِيَاهٍ ثُمَّ إِنَّهُ أَصْبَحَ فَأَسْلَمَ فَأَمَرَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم بِشَاةٍ فَشَرِبَ حِلاَبَهَا ثُمَّ أَمَرَ بِأُخْرَى فَلَمْ يَسْتَتِمَّهَا فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الْمُؤْمِنُ يَشْرَبُ فِي مِعًى وَاحِدٍ وَالْكَافِرُ يَشْرَبُ فِي سَبْعَةِ أَمْعَاءٍ " .
A believer drinks In one intestine whereas a non-believer drinks in seven intestines.