Sayyiduna Rafi' bin Khadij (may Allah be pleased with him) said to the Messenger of Allah (peace and blessings be upon him): "We hope, or we fear, that we will meet the enemy, and we have no knives with us; may we slaughter with a reed?" He (peace and blessings be upon him) said: "Whatever makes the blood flow and the name of Allah has been mentioned over it, eat it, but do not slaughter with a tooth or a nail."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الضحايا / 19144