Exodus 29:6-9
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6and you shall set the turban on his head and put the holy crown on the turban. 7Then you shall take the anointing oil and pour it on his head, and anoint him. 8You shall also bring his sons and put tunics on them. 9And you shall wrap their waists with sashes, Aaron and his sons, and fit caps on them, and they shall have the priesthood by a permanent statute. So you shall ordain Aaron and his sons.