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Which biblical source is thought to contain most of the material about Aaron?

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Aaron Aaron, detail of a 3rd-century fresco from the synagogue at Doura-Europus, Syria; in the National Museum, Damascus

Biblical scholars generally agree that approximately 90 percent of the material concerning Aaron is attributed to the Priestly code, one of the primary sources or layers of tradition that comprise the Pentateuch.1

While the figure of Aaron is constructed from several distinct traditions—including the Yahwist source, the Elohist, and the Deuteronomist—the Priestly source contains the main bulk of these narratives. This source became particularly prominent during a period when priests held a dominant position in Judah, leading to a tradition where Aaron, rather than Moses, served as the central hero for the priesthood.1