Exodus 28:1

Then He said to Moses, “Come up to Yahweh, you and Aaron, Nadab and Abihu and seventy of the elders of Israel, and you all shall worship at a distance.

“Take Aaron and his sons with him, and the garments and the anointing oil and the bull of the sin offering and the two rams and the basket of unleavened bread,

‘And did I not choose them from all the tribes of Israel to be My priests, to go up to My altar, to burn incense, to carry an ephod before Me; and did I not give to the house of your father all the fire offerings of the sons of Israel?

The sons of Amram were Aaron and Moses. And Aaron was separated in order to sanctify him as most holy, he and his sons forever, to offer offerings up in smoke before Yahweh, to minister to Him and to bless in His name forever.

For every high priest taken from among men is appointed on behalf of men in things pertaining to God, in order to offer both gifts and sacrifices for sins,

And no one takes this honor to himself, but receives it when he is called by God, even as Aaron was.

The Priests’ Garments