Leviticus 16:4

“You shall make for them linen undergarments to cover their bare flesh; they shall reach from the loins even to the thighs.

“Then Aaron shall come into the tent of meeting and take off the linen garments which he put on when he went into the holy place and shall leave them there.

“And he shall bathe his body with water in a holy place and put on his clothes and come forth, and offer his burnt offering and the burnt offering of the people and make atonement for himself and for the people.

“So the priest who is anointed and ordained to minister as a priest in his father’s place shall make atonement: he shall thus put on the linen garments, the holy garments,

And behold, six men were coming from the direction of the upper gate which faces north, each with his shattering weapon in his hand; and among them was a certain man clothed in linen with a scribe’s case at his loins. And they went in and stood beside the bronze altar.

“Linen headdresses shall be on their heads, and linen undergarments shall be on their loins; they shall not gird themselves with anything which makes them sweat.

“And when they go out into the outer court, into the outer court to the people, they shall put off their garments in which they have been ministering and lay them in the holy chambers; then they shall put on other garments so that they will not transmit holiness to the people with their garments.