'During' in the Bible

"Tell the Israelites, 'When a woman produces offspring and bears a male child, she will be unclean seven days, as she is unclean during the days of her menstruation.

If she bears a female child, she will be impure fourteen days as during her menstrual flow, and she will remain sixty-six days in blood purity.

Anything she lies on during her menstruation will be unclean, and anything she sits on will be unclean.