The lineage of the High Priesthood is presented once again, focusing on the unique sacred duties and the founding generations of this holy dynasty. The descendants of Aaron are specifically appointed to perform the most sacred work within the Holy of Holies [מצודת דוד]. Their responsibilities also include burning incense and offering sacrifices on both the altar of burnt offerings and the altar of incense [רש״י].
The record outlines the very beginning of this priestly line, starting with Aaron's son Eleazar, continuing through his son Phinehas, and then to Abishua [ביאור שטיינזלץ]. This genealogy mirrors a list presented earlier in the biblical record, which traced the priestly family all the way down to the destruction of the Temple. Yet, the current record is noticeably shorter, pausing at the generations of Ahimaaz and Zadok. The reason for this difference is rooted in the timing of the original document. Because this specific record was authored during the reigns of David and Solomon, it only tracks the family line up to their era, or extending slightly to the days of Rehoboam [רד״ק, מלבי״ם, מצודת דוד, ביאור שטיינזלץ].