Leviticus 8:3-7

and assemble all the congregation at the doorway of the tent of meeting.”

So Moses did just as the Lord commanded him. When the congregation was assembled at the doorway of the tent of meeting,

Moses said to the congregation, “This is the thing which the Lord has commanded us to do.”

Then Moses had Aaron and his sons come near, and he washed them with water.

Then he put the tunic on Aaron and wrapped his waist with the sash, and clothed him with the robe and put the ephod on him; and he wrapped his waist with the artistic band of the ephod, with which he fitted it to him.