Ezekiel 44:26

After a priest is made clean, he must wait seven days.

Numbers 6:10-21

The eighth day he must bring two mourning doves or two young pigeons to the priest at the entrance to the tent of meeting.

Numbers 19:11-14

Those who touch a corpse are ritually unclean for seven days.

Hebrews 9:13-14

The blood of goats and bulls, and the ashes from the burning of a young cow, sprinkled on the unclean made them outwardly clean.

Treasury of Scripture Knowledge

Summary

And after he is cleansed, they shall reckon unto him seven days.

Bible References

General references

Numbers 6:10
The eighth day he must bring two mourning doves or two young pigeons to the priest at the entrance to the tent of meeting.
Numbers 19:11
Those who touch a corpse are ritually unclean for seven days.
Hebrews 9:13
The blood of goats and bulls, and the ashes from the burning of a young cow, sprinkled on the unclean made them outwardly clean.