Chronicles I 6:49

49 And Aaron and his sons to burn incense on the altar of whole-burnt-offerings, and on the altar of incense, for all the ministry the holy of holies, and to make atonement for Israel, according to all things that Moses the servant of the Lord commanded.

Chronicles I 6:49 Meaning and Commentary

Ver. 49-53. But Aaron and his sons
Those that descended from him, though of the same tribe of Levi were all priests:

and they offered upon the altar of burnt offerings;
the daily sacrifice, and all the offerings of the people brought to them:

and on the altar of incense;
they burnt incense night and morning: and were appointed

for all the work of the place most holy;
such as were high priests of the line of Eleazar, whose work it was to go into the most holy place once a year:

to make atonement for all Israel, according to all that Moses the
servant of God commanded;
in ( Leviticus 16:1 ) which see; and on mention of this, a list of the high priests from Aaron, in the line of Eleazar, is given, to the times of Solomon, in the four following verses, just in the same order as in ( 1 Chronicles 6:4-8 ) .

Chronicles I 6:49 In-Context

47 the son of Mooli, the son of Musi, the son of Merari, the son of Levi.
48 And their brethren according to the houses of their fathers, the Levites who were appointed to all the work of ministration of the tabernacle of the house of God.
49 And Aaron and his sons to burn incense on the altar of whole-burnt-offerings, and on the altar of incense, for all the ministry the holy of holies, and to make atonement for Israel, according to all things that Moses the servant of the Lord commanded.
50 And these the sons of Aaron; Eleazar his son, Phinees his son, Abisu his son,
51 Bokki his son, Ozi his son, Saraia his son,

The Brenton translation of the Septuagint is in the public domain.