Volume 7, Book 65, Number 305:
Narrated Nafi’:
Ibn ‘Umar never used to take his meal unless a poor man was called to eat with him. One day I
brought a poor man to eat with him, the man ate too much, whereupon Ibn ‘Umar said, “O Nafi’!
Don’t let this man enter my house, for I heard the Prophet saying, “A believer eats in one intestine (is
satisfied with a little food), and a kafir (unbeliever) eats in seven intestines (eats much food).”
Volume 7 – 1209 / 1700
SAHIH BUKHARI VOLUME 7 > BOOK 65: FOOD, MEALS