Sayyiduna Sukayn al-Damri (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "The believer eats in one intestine, and the disbeliever eats in seven intestines."
Al-Bazzar recorded it from his teacher al-Haytham bin Safwan bin Hubayrah. I have not found anyone who gives his biography. The remaining narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأطعمة / 7968