Exodus 29:35
This is what you are to do for Aaron and his sons based on all that I have commanded you, taking seven days to ordain them.
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And thus shalt thou do unto Aaron, and to his sons, according to all things which I have commanded thee: seven days shalt thou consecrate them.
“You shall do so to Aaron and to his sons, according to all that I have commanded you. You shall consecrate them seven days.