Leviticus 8:33
You must not go outside the entrance to the tent of meeting for seven days, until the time your days of ordination are completed, because it will take seven days to ordain you.
Exodus 29:35
“This is what you are to do for Aaron and his sons based on all I have commanded you. Take seven days to ordain them.
Exodus 29:30
Any priest who is one of his sons and who succeeds him and enters the tent of meeting to minister in the sanctuary must wear them for seven days.
Leviticus 14:8
The one who is to be cleansed must wash his clothes, shave off all his hair, and bathe with water; he is clean. Afterward he may enter the camp, but he must remain outside his tent for seven days.
Numbers 19:12
He is to purify himself with the water
Ezekiel 43:25-27
You will offer a goat for a sin offering each day for seven days.