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Dedication of the Priests
7Then anoint him by pouring the anointing oil over his head. 8Next present his sons, and dress them in their tunics. 9Wrap the sashes around the waists of Aaron and his sons, and put their special head coverings on them. Then the right to the priesthood will be theirs by law forever. In this way, you will ordain Aaron and his sons.
Exodus 29:7-9 (NLT)