Sahih Bukhari
Prophetic Commentary on the Quran (Tafseer of the Prophet (PBUH))
Volume: 006 / Book Number: 060 / Hadith Number: 148
Narrated Aisha:
Allah's Apostle said, "I saw Hell and its different portions were consuming each other and saw 'Amr dragging his intestines (in it), and he was the first person to establish the tradition of letting animals loose (for the idols)."