Leviticus 13:54

13:54 the priest is to command that they wash whatever has the infection and quarantine it for another seven days.

Leviticus 23:42

23:42 You must live in temporary shelters for seven days; every native citizen in Israel must live in temporary shelters,

Leviticus 26:24

26:24 I myself will also walk in hostility against you and strike you seven times on account of your sins.