Leviticus 8:2-6

“Take Aaron and his sons with him, and the garments, the anointing oil, a bull as the sin offering, two rams, and a basket of unleavened bread; and gather all the congregation together at the door of the tabernacle of meeting.” So Moses did as the LORD commanded him. And the congregation was gathered together at the door of the tabernacle of meeting. And Moses said to the congregation, “This is what the LORD commanded to be done.” Then Moses brought Aaron and his sons and washed them with water.