Sunan Ibn Majah 3178

Muḥammad ibn ʿAbd Allāh ibn Numayr narrated to us: ʿUmar ibn ʿUbayd al-Ṭanāfisī narrated to us, from Saʿīd ibn Masrūq, from ʿAbāyah ibn Rifāʿah, from his grandfather Rāfiʿ ibn Khadīj, who said: We were with the Messenger of God (peace and blessings be upon him) on a journey. I said: Messenger of God, we go on military expeditions without knives. He said: Whatever makes the blood flow and has the name of God mentioned over it, eat it, except a tooth or a fingernail, for a tooth is a bone and a fingernail is the knife of the Ethiopians.