Exodus 28:40-43

ECB(i) 40 And work coats for the sons of Aharon and work girdles for them and work turbans for them for honor and for adornment. 41 And put them on Aharon your brother and his sons with him; and anoint them and fill their hand and hallow them, to priest the priesthood to me. 42 And work them linen breeches to cover the flesh of their nakedness; reaching from the loins even to the flank: 43 and so be they on Aharon and on his sons when they come in the tent of the congregation or when they come near the sacrifice altar to minister in the holies; that they not bear perversity and die. - an eternal statute to him and his seed after him.