Leviticus 15:19

The menses of a woman. - "If a woman have an issue, (if) blood is her issue in her flesh, she shall be seven days in her uncleanness." As the discharge does not last as a rule more than four or five days, the period of seven days was fixed on account of the significance of the number seven. In this condition she rendered every one who touched her unclean (Lev 15:19), everything upon which she lay or sat (Lev 15:20), every one who touched her bed or whatever she sat upon (Lev 15:21, Lev 15:22), also any one who touched the blood upon her bed or seat (Lev 15:23, where הוּא and בּו are to be referred to דּם); and they remained unclean till the evening, when they had to wash their clothes and bathe themselves.

This is concerning the ceremonial uncleanness which women lay under from their issues, both those that were regular and healthful, and according to the course of nature (Lev 15:19-24), and those that were unseasonable, excessive, and the disease of the body; such was the bloody issue of that poor woman who was suddenly cured by touching the hem of Christ's garment, after she had lain twelve years under her distemper, and had spent her estate upon physicians and physic in vain. This made the woman that was afflicted with it unclean (Lev 15:25) and every thing she touched unclean, Lev 15:26, Lev 15:27. And if she was cured, and found by seven days' trial that she was perfectly free from her issue of blood, she was to be cleansed by the offering of two turtle-doves or two young pigeons, to make an atonement for her, Lev 15:28, Lev 15:29. All wicked courses, particularly idolatries, are compared to the uncleanness of a removed woman (Eze 36:17), and, in allusion to this, it is said of Jerusalem (Lam 1:9), Her filthiness is in her skirts, so that (as it follows, Lev 15:17) she was shunned as a menstruous woman. I. The reasons given for all these laws (which we are ready to think might very well have been spared) we have, Lev 15:31. 1. Thus shall you separate the children of Israel (for to them only and their servants and proselytes these laws pertained) from their uncleanness; that is, (1.) By these laws they were taught their privilege and honour, that they were purified unto God a peculiar people, and were intended by the holy God for a kingdom of priests, a holy nation; for that was a defilement to them which was not so to others. (2.) They were also taught their duty, which was to preserve the honour of their purity, and to keep themselves from all sinful pollutions. It…

15:19-23 There is nothing wrong or diseased about a woman’s menstrual period. However, because it is accompanied by a bloody discharge, the woman was considered ceremonially unclean (see 15:32-33). The restrictions were similar to the restrictions on the man with the bodily discharge (15:2-12): She was allowed to live at home, but whatever she sat on became unclean. Anyone who touched her had to wash, and presumably she also did so at the end of the seven-day quarantine. However, no animal sacrifice was required.