Leviticus 8:35

“You shall put them on Aaron your brother and on his sons with him; and you shall anoint them and ordain them and set them apart as holy, that they may minister to Me as priests.

“You shall gird them with sashes, Aaron and his sons, and bind caps on them, and they shall have the priesthood by a perpetual statute. So you shall ordain Aaron and his sons.

‘For seven days you shall offer daily a goat for a sin offering; also a bull from the herd and a ram from the flock, without blemish, shall be offered.