Sahih Bukhari | Volume 4 | Hadith Number 723
Narrated by Said bin Al-Musaiyab
Al-Bahira was an animal whose milk was spared for the idols and other deities, and so nobody was allowed to milk it. As-Saiba was an animal which they (i.e infidels) used to set free in the names of their gods so that it would not be used for carrying anything. Abu Huraira said, "The Prophet said, 'I saw Amr bin 'Amir bin Luhai Al-Khuzai dragging his intestines in the (Hell) Fire, for he was the first man who started the custom of releasing animals (for the sake of false gods).'"