Muwatta Malik, Book 49, Hadith 1682 (In-Book)

Yahya related to me from Malik from Abu'z-Zinad from al-Araj that Abu Hurayra said, "The Messenger of Allah, may Allah bless him and grant him peace, said, 'The muslim eats in one intestine, and the kafir eats in seven!' "

حَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ يَأْكُلُ الْمُسْلِمُ فِي مِعًى وَاحِدٍ وَالْكَافِرُ يَأْكُلُ فِي سَبْعَةِ أَمْعَاءٍ ‏" ‏ ‏.‏

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also referenced under: Book 49, Hadith 9 (USC-MSA)