What did Prophet Muhammad (peace be upon him) say regarding the use of a knife to slaughter an animal?
 Narrated Rafi` bin Khadij:                     that he said, "O Allah's Apostle! We have no knife." The Prophet said, "if the killing tool causes blood to gush out, and if Allah's Name is mentioned, eat (of the slaughtered animal). But do not slaughter with a nail or a tooth, for the nail is the knife of Ethiopians and a tooth is a bone." Suddenly a camel ran away and it was stopped (with an arrow). The Prophet then said, "Of these camels there are some which are as wild as wild beasts; so if one of them runs away from you and you cannot catch it, treat it in this manner (i.e. shoot it with an arrow).