Exodus 28:42-43

28:42 Make for them linen undergarments to cover their naked bodies; they must cover from the waist to the thighs. 28:43 These must be on Aaron and his sons when they enter to the tent of meeting, or when they approach the altar to minister in the Holy Place, so that they bear no iniquity and die. It is to be a perpetual ordinance for him and for his descendants after him.

Exodus 28:1

The Clothing of the Priests

28:1 “And you, bring near to you your brother Aaron and his sons with him from among the Israelites, so that they may minister as my priests – Aaron, Nadab and Abihu, Eleazar and Ithamar, Aaron’s sons.

Colossians 1:1

Salutation

1:1 From Paul, an apostle of Christ Jesus by the will of God, and Timothy our brother,