It was narrated that Rafi’ bin KhadIj said: “I said: ‘Messenger of Allah صلی اللہ علیہ وآلہ وسلم, we are going to meet the enemy tomorrow and we do not have any knives.’ The Messenger of Allah صلی اللہ علیہ وآلہ وسلم 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.” (Sahih)