Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) narrates: We were on a military expedition with the Prophet (peace and blessings be upon him), and a man among the people said: O Messenger of Allah, tomorrow morning we will attack the enemy and we have no knives; may we slaughter with a reed or a flint stone? He (peace and blessings be upon him) said: "Yes, mention the name of Allah over it and eat, except a tooth and a nail. The tooth is bone, and the nail is the knife of the Abyssinians."
Hadith Referenceالمعجم الكبير للطبراني / باب الراء / 4373