Ezekiel 44:26

And after he has been made clean, seven days are to be numbered for him.

Numbers 6:10-21

And on the eighth day let him take to the priest, at the door of the Tent of meeting, two doves or two young pigeons;

Numbers 19:11-14

Anyone touching a dead body will be unclean for seven days:

Hebrews 9:13-14

For if the blood of goats and oxen, and the dust from the burning of a young cow, being put on the unclean, make the flesh 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
And on the eighth day let him take to the priest, at the door of the Tent of meeting, two doves or two young pigeons;
Numbers 19:11
Anyone touching a dead body will be unclean for seven days:
Hebrews 9:13
For if the blood of goats and oxen, and the dust from the burning of a young cow, being put on the unclean, make the flesh clean:

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain