The Prophet ﷺ said, "The believer eats with one intestine, while the disbeliever eats with seven intestines."
حدثنا يحيى عن عبيد الله أخبرني نافع
عن النبي ﷺ قال المؤمن يأكل في معى واحد والكافر يأكل في سبعة أمعاء
Its isnad is sahih. Tirmidhi narrated it (87) from Muhammad bin Bashshar from Yahya bin Saeed with this isnad. Its commentator also attributed it to the two Shaykhs and Ibn Majah.The word mi'a, vocalized with a kasra on the mim, a fatha on the ain, and a shortened alif, is the singular of amaa, meaning the intestines, that is, the guts.Ibn Athir said, This is an example given for the believer and his asceticism regarding this world, and for the disbeliever and his greed for it. It does not mean eating a great deal without becoming full in this world. That is why it was said, "Greed is an ill omen" [al-raghb, with a damma on the ra and a sukoon on the ain], because it drives its possessor to plunge into the Fire. And it was said, it is an incitement for the believer to avoid the hardness of heart and submission to desire that satiety brings about. Describing the disbeliever as eating a great deal is a way of pressing the point more firmly upon the believer, and of reinforcing what has been prescribed for him. All of this is correct and can be understood from the hadith, and it appears that all of it is intended.