Exodus 28:39-43

“Make the woven inner robe of fine linen. Make the turban of fine linen, also. Make the cloth belt with designs sewn on it. Also make woven inner robes, cloth belts and headbands for Aaron’s sons. This will give them honor and beauty. Put these clothes on your brother Aaron and his sons. Then pour olive oil on their heads to appoint them as priests. Make them belong to me so they may serve me as priests. “Make for them linen underclothes to cover them from the waist to the upper parts of the legs. Aaron and his sons must wear these underclothes when they enter the Meeting Tent. And they must wear these clothes anytime they come near the altar to serve as priests in the Holy Place. If they do not wear these clothes, they will be guilty of wrong. And they will be killed. This will be a law that will last from now on for Aaron and all his descendants.