'Impure' in the Bible

‘Now if a woman has a discharge of her blood many days, not at the period of her menstrual impurity, or if she has a discharge beyond that period, all the days of her impure discharge she shall continue as though in her menstrual impurity; she is unclean.

The priest shall offer the one for a sin offering and the other for a burnt offering. So the priest shall make atonement on her behalf before the Lord because of her impure discharge.’