Sayyiduna Rafi‘ bin Khadij (may Allah be pleased with him) narrates: We said,“O Messenger of Allah! Tomorrow we will face the enemy, and we do not have knives with us, so can we slaughter animals with the bark of a tree?”The Prophet (peace and blessings be upon him) said:“Whatever causes blood to flow, and you have mentioned Allah’s name upon it, eat of it, except that which is slaughtered with a tooth (i.e., bone) or a nail (the specific knife of the Abyssinians).”‘Tooth’ refers to a human bone, and ‘nail’ is the specific knife of the Abyssinians (these words are perhaps from the narrator).