Aaronites

the descendants of Aaron, and therefore priests. Jehoiada, the father of Benaiah, led 3,700 Aaronites as "fighting men" to the support of David at Hebron (1Chr 12:27). Eleazar (Num 3:32), and at a later period Zadok (1Chr 27:17), was their chief.

EBD - Easton's Bible Dictionary