وَعَنْهُ أَنَّ رَجُلًا كَانَ يَأْكُلُ أَكْلًا كَثِيرًا فَأَسْلَمَ فَكَانَ يَأْكُلُ قَلِيلًا فَذَكَرَ ذَلِكَ لِلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ: «إِنَّ الْمُؤْمِنَ يَأْكُلُ فِي مِعًى وَاحِدٍ وَالْكَافِرُ يَأْكُلُ فِي سبعةِ أمعاء» . رَوَاهُ البُخَارِيّ
He told that a man who used to eat a great amount accepted Islam and began to eat little. When that was mentioned to the Prophet he said, “The believer eats in one intestine but the infidel in seven.” Bukhari transmitted it.