Musannaf Ibn Abi Shayba 16:320

Abu Bakr narrated to us, he said: Zayd ibn al-Hubab narrated to us, from Musa ibn Ubaydah, he said: Ubayd al-Aghar narrated to me, from Ata ibn Yasar, from Jahjah al-Ghifari, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The disbeliever eats in seven intestines, and the believer eats in one intestine."