(12) باب الْمُؤْمِنُ يَأْكُلُ فِي مِعًى وَاحِدٍ
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "A Muslim eats in one intestine (i.e. he is satisfied with a little food) while a Kafir (unbeliever) eats in seven intestines (eats much).
Reference: Sahih al-Bukhari 5396
In-book reference: Book 70, Hadith 24
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 65, Hadith 308