The term that represents the Priestly “source” or tradition in the Pentateuch, parts of which were written ca. 550 b.c.e. by Aaronid priests, and other parts, notably the “Holiness Code” (Lev. 17–26), that might represent traditions of one to two hundred years earlier. The Priestly source, as its name suggests, is marked by the unmistakable interests of the priesthood and ceremonial sanctity, and by the kind of precise attention to detail associated with a priestly way of thinking and acting. A concern with ritual origins and laws, as well as with the chronological details of Israel’s past is evident. Because the priesthood was a hereditary office in Israel, there is also an interest in genealogies. See also Documentary Hypothesis.