Ezekiel 43:25
"Every day for a week, you are to prepare a goat for a sin offering, a young bull, and a ram from the flock, each without defect.
Leviticus 8:33
Furthermore, you are not to go out past the entrance to the Tent of Meeting until the days of your ordination have been completed, since it will take seven days to ordain you.
Exodus 29:35-37
You are to do this for Aaron and his sons, just as I've commanded you. You are to ordain them for seven days,
Leviticus 8:35
Stay seven days and nights at the entrance to the Tent of Meeting and attend to the service of the LORD, so that you won't die, because this is what I've commanded."