Leviticus 6:10

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

‘If his offering is a burnt offering from the herd, he shall bring it near, a male without blemish; he shall bring it near to the doorway of the tent of meeting, that he may be accepted before Yahweh.

‘And the sons of Aaron the priest shall put fire on the altar and arrange wood on the fire.

‘He shall also take away its crop with its feathers and cast it beside the altar eastward, to the place of the ashes.

that is, all the rest of the bull, he shall bring out to a clean place outside the camp where the ashes are poured out, and he shall burn it on wood with fire; where the ashes are poured out it shall be burned.

“Take Aaron and his sons with him, and the garments and the anointing oil and the bull of the sin offering and the two rams and the basket of unleavened bread,

“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.