'Period' in the Bible

and does not eat at the mountain shrines or lift up his eyes to the idols of the house of Israel, or defile his neighbor’s wife or approach a woman during her menstrual period—

They have sex with their father's wife within you; they violate women during their menstrual period within you.

"Son of man, when the house of Israel was living on their own land, they defiled it by their behavior and their deeds. In my sight their behavior was like the uncleanness of a woman having her monthly period.

For a seven day period they are to make atonement for the altar, purifying it and consecrating it.

When they will have completed this period, starting the next day, the priests are to offer your burnt offerings on the altar, along with your peace offerings, and I will accept you,' declares the Lord GOD."

After a priest has become ceremonially clean, they must count off a period of seven days for him.