Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
bukhari:5394Muḥammad b. Salām > ʿAbdah > ʿUbaydullāh > Nāfiʿ > Ibn ʿUmar

Messenger of Allah ﷺ said, "A believer eats in one intestine (is satisfied with a little food), and a kafir (unbeliever) or a hypocrite eats in seven intestines (eats too much).  

البخاري:٥٣٩٤حَدَّثَنَا مُحَمَّدُ بْنُ سَلاَمٍ أَخْبَرَنَا عَبْدَةُ عَنْ عُبَيْدِ اللَّهِ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ ؓ

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ الْمُؤْمِنَ يَأْكُلُ فِي مِعًى وَاحِدٍ وَإِنَّ الْكَافِرَ أَوِ الْمُنَافِقَ فَلاَ أَدْرِي أَيَّهُمَا قَالَ عُبَيْدُ اللَّهِ يَأْكُلُ فِي سَبْعَةِ أَمْعَاءٍ وَقَالَ ابْنُ بُكَيْرٍ حَدَّثَنَا مَالِكٌ عَنْ نَافِعٍ عَنِ ابْنِ عُمَرَ عَنِ النَّبِيِّ ﷺ بِمِثْلِهِ