The Theocracy: or Immediate Government by God: Consisted in His: Appointing Ecclesiastical officers
Source: TTT
Exodus 28:1
“Next, have your brother Aaron brought to you from among the Israelites, along with his sons Nadab, Abihu, Eleazar, and Ithamar, to serve Me as priests.
Exodus 40:12–15
Then bring Aaron and his sons to the entrance to the Tent of Meeting and wash them with water. / And you are to clothe Aaron with the holy garments, anoint him, and consecrate him, so that he may serve Me as a priest. / Bring his sons forward and clothe them with tunics.