Read Exodus 29:35 Using Other Translations
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.
"Thus you shall do to Aaron and to his sons, according to all that I have commanded you. Through seven days shall you ordain them,
“This is how you will ordain Aaron and his sons to their offices, just as I have commanded you. The ordination ceremony will go on for seven days.