Exodus 29:7-9
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7And you shall take the anointing oil, and pour it on his head and anoint him. 8Then you shall bring his sons, and put coats on them, 9and you shall gird them with girdles and bind caps on them; and the priesthood shall be theirs by a perpetual statute. Thus you shall ordain Aaron and his sons.
Exodus 29:7-9 (RSV)