Their fellow Levites were assigned to all the other duties of the tabernacle, the house of God.
References for 1 Chronicles 6:48
But Aaron and his descendants were the ones who presented offerings on the altar of burnt offering and on the altar of incense in connection with all that was done in the Most Holy Place, making atonement for Israel, in accordance with all that Moses the servant of God had commanded.
References for 1 Chronicles 6:49
These were the descendants of Aaron: Eleazar his son, Phinehas his son, Abishua his son,
Bukki his son, Uzzi his son, Zerahiah his son,
Meraioth his son, Amariah his son, Ahitub his son,
Zadok his son and Ahimaaz his son.
References for 1 Chronicles 6:53