Leviticus 15:25-30

²⁵ And if a woman has a flow of blood for a long time, not at the time when she generally has it, or if the flow goes on longer than the normal time, she will be unclean while the flow of blood goes on, as she is at other normal times. ²⁶ Every bed on which she has been resting will be unclean, as at the times when she normally has a flow of blood, and everything on which she has been seated will be unclean, in the same way. ²⁷ And anyone touching these things will be unclean, and his clothing will have to be washed and his body bathed in water and he will be unclean till evening. ²⁸ But when her flow of blood is stopped, after seven days she will be clean. ²⁹ And on the eighth day let her get two doves or two young pigeons and take them to the priest to the door of the Tent of meeting, ³⁰ To be offered by the priest, one for a sin-offering and one for a burned offering; and the priest will take away her sin before the Lord on account of her unclean condition.