Leviticus 15:28-31

28When the woman stops bleeding, she must count seven days. Then she will be clean.

29On the eighth day, she must take two birds to the door of the Tent of Meeting. They must be doves or pigeons. She must give them to the priest. He will sacrifice one bird for her sin and he will burn the other.

30He will kill them as an atonement to the Lord. Then the woman will be clean.

31The tabernacle is God's house. It is among Israel's people. The priests must keep the people away from anything that makes them unclean. If they are not clean, they will make the Tent of Meeting unclean. So they will die.’