Exodus 29:9 (WEB)
You shall clothe them with belts, Aaron and his sons, and bind headbands on them. They shall have the priesthood by a perpetual statute. You shall consecrate Aaron and his sons.
Catechism · 1
“A special rite consecrated the beginnings of the priesthood of the Old Covenant. the priests are "appointed to act on behalf of men in relation to God, to offer gifts and sacrifices for sins."” — Catechism footnote: Heb 5:1; cf. Ex 29:1-30; Lev 8.
