Ezekiel 44:17-18

17It shall be that when they enter at the gates of the inner court, they shall be clothed with 1linen garments; and wool shall not 2be on them while they are ministering in the gates of the inner court and in the house.

18Linen 3turbans shall be on their heads and 4linen undergarments shall be on their loins; they shall not gird themselves with anything which makes them sweat.