Bukhari :: Book 7 :: Volume 65 :: Hadith 305
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)."
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