Exodus 28:43

‘And you shall not go up by steps to My altar, so that your nakedness will not be exposed on it.’

“In the tent of meeting, outside the veil which is before the testimony, Aaron and his sons shall keep it in order from evening to morning before Yahweh; it shall be a perpetual statute throughout their generations for the sons of Israel.

“These are the garments which they shall make: a breastpiece and an ephod and a robe and a tunic of checkered work, a turban and a sash, and they shall make holy garments for Aaron your brother and his sons, in order for him to minister as priest to Me.

“So they shall wash their hands and their feet, so that they will not die; and it shall be a perpetual statute for them, for Aaron and his seed throughout their generations.”

“And he shall put the incense on the fire before Yahweh, that the cloud of incense may cover the mercy seat that is on the ark of the testimony, so that he will not die.

‘They shall therefore keep My charge so that they will not bear sin because of it and die thereby because they profane it; I am Yahweh who makes them holy.

“And it will be that when they enter at the gates of the inner court, they shall be clothed with linen garments; and wool shall not be on them while they are ministering in the gates of the inner court and in the house.