Leviticus 15:33
And of her that is sick of her flowers, and of him that hath an issue, of the man, and of the woman, and of him that lieth with her that is unclean. And of her that is sick of her flowers, and of him that hath an issue, of the man, and of the woman, and of him that lieth with her that is unclean.
Leviticus 15:33 sums up the regulations for uncleanness from menstruation and from bodily discharges in both man and woman, including lying with one who is unclean. Such discharges rendered a person ceremonially unclean, and the person had to be made visibly clean before the cleansing of the sanctuary with blood could apply. This was a physical uncleanness, distinct from the moral defilement that polluted the sanctuary in God's sight. The restrictions served as measures against infectious disease and its spread.
Contact with the patient or with articles he had used required isolation and washing, with washing in running water, while the recovered patient required seven days of cleansing. To be unclean until the evening meant isolation for the rest of the day, allowing air and sunshine to disinfect, and observance of these rules prevented epidemics. The discharge laws are grouped with the regulations on leprosy, a horrible disease that fittingly typifies sin. They belong among the laws governing the yearly round of service in the Levitical sanctuary, whose services typified Christ's ministry in the heavenly sanctuary.
They form part of the mighty object-lessons given in Leviticus to emphasize everywhere the exceeding sinfulness of sin. The dry details of laws and regulations become new life and a blessing when read with the remembrance that the sacrifices point forward to Jesus Christ as the Lamb of God that takes away the sin of the world. They stand among the laws of cleanliness given to ancient Israel as a cleansing work, carrying the lesson for Christians not to turn away from health reform and other cleansing truths.