"I said: 'O Messenger of Allah we are going to meet the enemy tomorrow and we do not have any knives.' The Messenger of Allah said: "If the blood is shed and the name of Allah is mentioned, then eat, unless (it is slaughtered (with teeth or nails, and I will tell you about that. As for teeth, they are bones, and as for nails, they are the knives of the Ethiopians."'
Reference: Sunan an-Nasa'i 4404 In-book : Book 43, Hadith 44 English translation : Vol. 5, Book 43, Hadith 4409
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