Exodus 29:4-9

Then bring Aaron and his sons to the entrance to the tent of meeting and wash them with water. Take the garments and dress Aaron with the tunic, the robe of the ephod, the ephod itself and the breastpiece. Fasten the ephod on him by its skillfully woven waistband. Put the turban on his head and attach the sacred emblem to the turban. Take the anointing oil and anoint him by pouring it on his head. Bring his sons and dress them in tunics and fasten caps on them. Then tie sashes on Aaron and his sons. The priesthood is theirs by a lasting ordinance. “Then you shall ordain Aaron and his sons.