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.

Leviticus 8:33
You must not go outside the entrance to the Tent of Meeting for seven days, until the days of your ordination are complete; for it will take seven days to ordain you.

Leviticus 8:35
You must remain at the entrance to the Tent of Meeting day and night for seven days and keep the LORD's charge so that you will not die, for this is what I have been commanded."

Ezekiel 43:22
On the second day you are to present an unblemished male goat as a sin offering, and the altar is to be cleansed as it was with the bull.

Ezekiel 43:26
For seven days the priests are to make atonement for the altar and cleanse it; so they shall consecrate it.