Leviticus 8:36

Overview - Leviticus 8
Moses consecrates Aaron and his sons.
14 Their sin offering.
18 Their burnt offering.
22 The ram of consecration.
31 The place and time of their consecration.
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Leviticus 8:36  (King James Version)
So Aaron and his sons did all things which the LORD commanded by the hand of Moses.

This was necessary to be added, to show the exact fulfilment of the commandments delivered to Moses, and which are recorded in Exodus, ch. 29; and consequently the complete consecration and preparation of Aaron and his sons to fill the awfully important office of priests and mediators between God and the children of Israel, to offer sacrifices, and make atonement for the sins of the people.
Exodus 39:43 ; 40:16 Deuteronomy 4:2 ; 12:32 1 Samuel 15:22