Aaron and his sons minister in priest's office—Levites chosen to do
service of tabernacle—They are the Lord's, replacing firstborn of all
families of Israel—Their number, charge, and service set forth.
9a give the Levites unto Aaron and to his
sons Aaron was Moses' older brother, the firstborn of his family.
There is a presidence for giving the charge of the Tribe of Levi unto Aaron
and not unto Moses the prophet. Moses was the prophet over all of Isreal, and
as also aready discussed, there is reason to consider that Moses was of the
House of Joseph over the House of Levi, though he was the younger brother of
Aaron and a Levite by birth.