Leviticus 15:25-26

25And if a woman shall have an issue of her blood many days out of the time of her separation, or if it shall run beyond the time of her separation; all the days of the issue of her uncleanness shall be as the days of her separation: she shall be unclean. 26Every bed on which she lieth all the days of her issue shall be to her as the bed of her separation: and whatever she sitteth upon shall be unclean, as the uncleanness of her separation.