Leviticus 15:23

A woman's menstrual period is natural and not a disease. But because it involved a bloody discharge, she became ceremonially unclean (see Leviticus 15:32–33). The rules were similar to those for a man with a bodily discharge (15:2–12). She could stay at home, but anything she sat on became unclean. Anyone who touched her had to wash, and she probably did the same after the seven-day quarantine. There was no animal sacrifice needed.

The idea of normal and abnormal, along with the created order, helps interpret these rules (see “Clean, Unclean, and Holy” Theme Note). Bodily discharges, like infections (see study note on Leviticus 13:1–46), were not considered "normal" because they weakened a person's health. This made the person seem incomplete. Whether male (15:1–18) or female (15:19–33), such a person became unclean.

UNCLEANNESS OF WOMEN. (Lev 15:19-33)

if a woman have an issue--Though this, like the leprosy, might be a natural affection, it was anciently considered contagious and entailed a ceremonial defilement which typified a moral impurity. This ceremonial defilement had to be removed by an appointed method of ceremonial expiation, and the neglect of it subjected any one to the guilt of defiling the tabernacle, and to death as the penalty of profane temerity.

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 was easy for them to argue that if those pollutions which were natural, unavoidable, involuntary, their affliction and not their sin, rendered them for the time so odious that they were not fit for communion either with God or man, much more abominable and filthy were they if they sinned against the light and law of nature, by drunkenness, adultery, fraud, and the like sins, which defile the very mind and conscience. And, if these ceremonial pollutions could not be done away but by sacrifice and offering, something greater and much more valuable must be expected and depended upon for the purifying of the soul from the uncleanness of sin. 2. Thus their dying in their uncleanness by the hand of God's justice, if while they were under any of these defilements they should come near the sanctuary, would be prevented. Note, It is a dangerous thing to die in our uncleanness; and it is our own fault if we do, since we have not only fair warning given us, by God's law, against those things that will defile us, but also such gracious provision made by his gospel for our cleansing if at any time we be defiled. 3. In all these laws there seems to be a special regard had to the honour of the tabernacle, to which none must approach in their uncleanness, that they defile not my tabernacle. Infinite Wisdom took this course to preserve in the minds of that careless people a continual dread of, and veneration for, the manifestations of God's glory and presence among them in his sanctuary. Now that the tabernacle of God was with men familiarity would be apt to breed contempt, and therefore the law made so many things of frequent incidence to be ceremonial pollutions, and to involve an incapacity of drawing near to the sanctuary (making death the penalty), that so they might not approach without great caution, and reverence, and serious preparation, and fear of being found unfit. Thus they were taught never to draw near to God but with an awful humble sense of their distance and danger, and an exact observance of every thing that was required in order to their safety and acceptance.
II. And what duty must we learn from all this? 1. Let us bless God that we are not under the yoke of these carnal ordinances, that, as nothing can destroy us, so nothing can defile us, but sin. Those may now partake of the Lord's supper who durst not then eat of the peace-offerings. And the defilement we contract by our sins of daily infirmity we may be cleansed from in secret by the renewed acts of repentance and faith, without bathing in water or bringing an offering to the door of the tabernacle. 2. Let us carefully abstain from all sin, as defiling to the conscience, and particularly from all fleshly lusts, possessing our vessel in sanctification and honour, and not in the lusts of uncleanness, which not only pollute the soul, but war against it, and threaten its ruin. 3. Let us all see how indispensably necessary real holiness is to our future happiness, and get our hearts purified by faith, that we may see God. Perhaps it is in allusion to these laws which forbade the unclean to approach the sanctuary that when it is asked, Who shall stand in God's holy place? it is answered, He that hath clean hands and a pure heart (Psa 24:3, Psa 24:4); for without holiness no man shall see the Lord.

And if a woman have an issue. Women are now spoken of who suffer under a twofold issue of blood; for with almost all it occurs every month, (whence it is called menses, or menstruation,) and some labor under a constant hemorrhage. He declares both to be unclean; and, after menstruation, a certain period of separation is appointed, during which the law prohibited their cohabitation with men; but, if the blood flowed beyond the usual time, the time of purification is postponed until it ceased. Whence it appears, that in every shameful thing the Jews were reminded of their uncleanness, that thus they might be accustomed to modesty and seek after purity. And this still more clearly appears at the end of the chapter, where it is said, (v. 3l,) "Thus shall ye separate the children of Israel from their uncleanness; that they die not -- when they defile my tabernacle." God, I say, briefly sets forth His intention that He would drive away all profanation far from His people; because he desires sincerity to prevail amongst his worshippers, and cannot bear his tabernacle to be polluted by any stain.

Footnotes:

[17] "Toute intemperance de la chair et lubricite, qu'on appelle." -- Fr. The negative is here added from the Fr

Footnotes:

[16] Heading added from Fr., "Des pollutions qui adviennent par flux."

They shall both bathe themselves - What a wonderful tendency had these ordinances to prevent all excesses! The pains which such persons must take, the separations which they must observe, and the privations which, in consequence, they must be exposed to in the way of commerce, traffic, etc., would prevent them from making an unlawful use of lawful things.

And if it be on her bed, or on anything whereon she sitteth,.... That is, if any person or thing should be upon her bed or seat; a vessel on her bed, or a vessel upon a vessel, as Aben Ezra expresses it:

when he toucheth it; that person or thing that should be on her bed or seat, as well as touch her bed or seat:

shall be unclean until the even; in a ceremonial sense; so defiling was a woman in such circumstances, and to whom the Scriptures often compare unclean persons and things: and Pliny (i) speaks of menstrues as very infectious, or worse, to various creatures and things, in a natural way.

(i) Nat. Hist. l. 7. c. 15.

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.