Leviticus 8:33
And you shall not go outside the entrance of the tent of meeting for seven days, until the days of your ordination are completed, for it will take seven days to ordain you.
Exodus 29:35
"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,
Exodus 29:30
The son who succeeds him as priest, who comes into the tent of meeting to minister in the Holy Place, shall wear them seven days.
Leviticus 14:8
And he who is to be cleansed shall wash his clothes and shave off all his hair and bathe himself in water, and he shall be clean. And after that he may come into the camp, but live outside his tent seven days.
Numbers 19:12
He shall cleanse himself with the water on the third day and on the seventh day, and so be clean. But if he does not cleanse himself on the third day and on the seventh day, he will not become clean.
Ezekiel 43:25-27
For seven days you shall provide daily a male goat for a sin offering; also, a bull from the herd and a ram from the flock, without blemish, shall be provided.