Exodus 29:7-9
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7Then shalt thou take the anointing oil, and pour it upon his head, and anoint him. 8And thou shalt bring his sons, and put coats upon them. 9And thou shalt gird them with girdles, Aaron and his sons, and put the bonnets on them: and the priest's office shall be theirs for a perpetual statute: and thou shalt consecrate Aaron and his sons.
Exodus 29:7-9 (KJV)