the collection of ancient rabbinic writings on Jewish law and tradition (the Mishna and the Gemara) that constitute the basis of religious authority in Orthodox Judaism
a system of jurisprudence based on judicial precedents rather than statutory laws; "common law originated in the unwritten laws of England and was later applied in the United States"
based on custom rather than documentation; "an unwritten law"; "rites...so ancient that they well might have had their unwritten origins in Aurignacian times"- J.L.T.C.Spence