Leviticus 15:25
And if a woman have an issue of her blood many days out of the time of her separation, or if it 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.
Leviticus 15:25 belongs to the laws regulating uncleanness and cleansing given to ancient Israel. It declares that a woman with a flow of blood for many days outside the time of her separation, or running beyond the time of her separation, remains unclean for all the days of the issue of her uncleanness as in the days of her separation. In this system those who touched the affected person or belongings had to wash, bathe, and remain unclean until evening, while the person after recovery had to observe seven days of cleansing, wash, and bathe in running water. These restrictions isolated cases and helped prevent infection from spreading and causing an epidemic in Israel's camp.
The physical uncleanness under this law was part of making an object visibly clean before the sanctuary's cleansing with blood, and it was distinct from the moral defilement that defiled the sanctuary in God's sight. The surrounding laws in chapters 12-15 also address leprosy, a horrible disease that serves as a fitting type of sin. The verse belongs to the mighty object-lessons in Leviticus that everywhere emphasize the exceeding sinfulness of sin. Its laws and regulations are types of Jesus Christ, with the slain beasts pointing forward to the Lamb of God who takes away the sin of the world.
It is included among the Levitical instructions in the yearly cycle of sanctuary service, which typified Christ's ministry in the heavenly sanctuary. These laws of cleansing teach God's people to follow health reform and other cleansing truths rather than turn away from them. So doing prepares them to receive the latter rain.