1169 – Rāfiʿ ibn Khadīj (may Allah be pleased with him) narrated that the Prophet ﷺ said: “Whatever makes the blood flow and over which the name of Allah is pronounced—eat of it, except a tooth and a fingernail: the tooth is bone, and the fingernail is the blades of the Abyssinians.” Agreed upon. (1)

Vocabulary of the ḥadith:
• “Whatever makes the blood flow”: mā is either conditional or relative; anhara is a past verb meaning “made (the blood) gush forth and flow copiously.”
• “then eat”: the apodosis of the conditional, or it conveys that sense implicitly.
• laysa: a past-tense verb from the sisters of kāna, classified as a verb that functions like a particle. Here it serves the purpose of exception, meaning “except,” and what follows it must be in the accusative because it is its predicate, as in “The people came, laysa Khālid-an.” Al-Muḥīṭ states that laysa can at times behave purely as a particle governing the accusative, like illā, as in “Bring them to me, laysa Zayd-an.” The sound position is that it remains a nāsikh verb whose subject is an implicit pronoun referring to part of what preceded; this pronoun is obligatorily elided, so only the accusative appears after it. I add: This is the usage found in the present ḥadith.
• al-sinn (the tooth): in the accusative as the predicate of laysa; with a kasrah on the sīn, it is a piece of bone that grows in the jaw, and it is grammatically feminine.
• al-ẓufr (the fingernail): likewise accusative because it is conjoined to the predicate of laysa; ẓufr is the horny substance at the ends of the fingers, plural aẓāfir and aẓāfīr.