It wasnarrated that Rafi' bin Khadij said:
"We were with the Prophet(ﷺ) on a journey, and I said: 'O Messenger of Allah, we are(sometimes) on military campaigns, and we have no knife with us.'Hesaid: '(Use) whatever causes the blood to flow, mention the NameofAllah and eat, but (do not use) teeth or nails, for the tooth is abone and the nail is the knife of the Ethiopians."
English reference: Vol. 4, Book 27, Hadith 3178
Arabic reference: Book 27, Hadith 3299