The Stain You May Explain

The Hook

By the Torah’s own law, a woman becomes impure as a niddah only when her body tells her: a physical sensation, and then blood. The ninth chapter of Hilchot Issurei Biah opens by saying exactly that, and then it turns to a decree of the Sages. A bloodstain discovered on her flesh or on her clothes makes her impure, even when she felt nothing, even when she examined herself and found nothing, because perhaps it came from within.

That is the fence. The remaining thirty-odd halachot of the chapter are something else. They are a long, patient catalogue of the ways a stain can be explained, measured, located and set aside. A stain too small. A stain on stone. A stain on a colored garment. A stain on her sleeve that could never have reached. A stain after she walked through the butchers’ market. A stain that her child may have left with a soiled hand. And in the middle of it all the Rambam states the principle out loud: our Sages did not say that one should rule stringently regarding these matters, only leniently. Why would the Sages build a fence and then spend an entire chapter building doors in it?

What the Torah Requires and What the Sages Added

The chapter begins by separating two layers. According to Scriptural Law, the impurity begins with sensation and begins only from the moment she menstruates; nothing reaches backward. According to Rabbinic Law, a stain renders her impure as if she had found bleeding within, and the impurity is called an impurity of doubt. Perhaps the stain came from her body. Perhaps it did not.

The Sages added a second concern. When a woman discovers bleeding at a time other than her veset, or discovers a stain, she is considered impure retroactively for twenty-four hours with regard to pure objects she touched. If she examined herself within those hours and found herself pure, the retroactive impurity reaches back only to that examination. And then, as in the previous chapter, the reach backward stops at the person. She does not render her husband impure retroactively, and she counts her days only from the time she discovered the bleeding or the stain.

The retroactive concern itself is withheld from women who are not expected to see. A woman who finds bleeding at the time of her veset is impure only from the moment of discovery, because that is simply when her cycle began. So too a woman who is pregnant, defined as one whose pregnancy is evident, three months along. A woman who is nursing, within twenty-four months of the birth. A girl who has never yet menstruated. And an elderly woman, one who has gone ninety days without a cycle near her old age. The Rambam even supplies a test for who counts as elderly: when others call her an old woman and she does not protest. The law knows people, and it is not without humor.

The Geography of a Stain

Now the measurements. A stain on her flesh has no minimum size. A stain on her garment renders her impure only if it is the size of a gris, half a large bean, a square large enough to hold nine lentils, three rows of three. Small scattered spots are not added together. A stain that is spread out counts as one.

Then the surfaces. If she sat on something that cannot contract ritual impurity, a stone vessel, earth, animal dung, fish skin, the outside of an earthenware vessel, or a scrap of cloth smaller than three fingerbreadths square, and blood was found there, she is pure. Even if she checked the earth before she sat on it and the stain appeared only afterward, she is pure, because the decree never extended to such things. Nor does a stain render her impure unless it is found on something white. For this reason, the Rambam says, the Sages advised women to wear colored garments, so that they would be spared needless worry over stains.

Then the body itself. Not every place counts, only the places that could have been reached. A stain on her heel renders her impure, since perhaps her foot touched her body as she sat. So too the inner calves, which touch when she stands, the tip of her toe, where blood could drip as she walks, and her hands, even the backs of her fingers, because hands are active. But a stain on the outer side of her calves, or from her thighs upward, leaves her pure, since it certainly came from somewhere else. On a garment, a stain below the belt renders her impure and one above it does not. On a sleeve, the question is simply whether that sleeve could reach. If she used the garment as a blanket at night, then every part of it could have reached.

The chapter then works through harder combinations. A woman who wore one tunic for three days outside her days of niddah and found three stains, or one stain the size of three, is in doubt whether she is a zavah, since perhaps each day left its mark. If she found a stain and then bleeding within twenty-four hours, the stain is joined to the bleeding and does not count as a separate day. The arithmetic is exacting, and it is exacting precisely so that a doubt will not be counted twice.

Every Reason to Be Pure

Then comes the heart of the chapter. Whenever there is a stain and something she could reasonably blame it on, she may say, the stain came from this. If it is found on her garment, she is pure. If she slaughtered an animal or a fowl, if she was handling stains, if she sat near people who were, or if she passed through the butchers’ market, a stain on her outer garment is attributed to that and she remains pure.

The flesh is treated more carefully, and the reasoning is honest. If a stain is found on her flesh alone, at her belt or below, she is impure, because blood from the market would have struck her clothing first. If she has a wound that could open and bleed, even one covered by a scab, she may attribute a stain on her flesh to it. If the stain is on both her garments and her flesh, she may use every explanation available. She may say a louse was crushed when she sat, but only up to the size of a gris, since a louse holds no more blood than that. She may attribute it to her son or her husband if their hands were soiled with blood or they had a wound, since a child touches his mother and a husband his wife without anyone noticing.

And the limits are as instructive as the leniencies. We do not imagine that blood traveled. A wound on her shoulder does not explain a stain on her calf; we do not say that perhaps she touched the one and then the other. Two women handled one fowl that held a sela’s worth of blood and each has a stain that large: both are impure, because the fowl cannot account for both. If she was occupied with red blood, she may not attribute a black stain to it. If she is not sure whether she even passed the market, she may not lean on it. Leniency here means looking for the true explanation, not manufacturing one.

The cases of shared clothing and shared beds follow. A woman who lent her garment to a niddah and then wore it unchecked may attribute a stain to the borrower. A tall woman wearing a short woman’s garment is impure only if the stain reaches the place opposite her own body. When three women wore one garment in turn, or slept in one bed, and a stain is found, all are impure, unless one of them examined herself at once and found blood, in which case the others are pure. If all examined and found themselves pure, the stain is attributed to the one most likely to see, and a woman who is pregnant, nursing or elderly, or a girl who has never menstruated, is pure beside her. Three women who climbed into a bed from its foot, so that their order is known, are judged by where they lay: blood beneath the middle one implicates all three, while blood beneath one at the edge implicates her and her neighbor, and the woman on the far side is pure.

Blood or Dye

The chapter’s last question is whether a stain is blood at all. When there is doubt whether a stain is blood or dye, seven cleaning agents are passed over it in order, three times each, rubbing back and forth: the saliva of a person who has not eaten, chewed beans, urine at least three days old, lye, natron, cumin powder and bleach. If the stain fades or disappears, it is blood. If it holds its color, it is dye, and she is pure. The Rambam defines even the saliva with care: from a person who ate nothing since nightfall, slept the latter half of the night, and has not spoken much in the first three hours of the morning, because a person who rose and reviewed his studies aloud has weakened his saliva until it is like water. Even the strength of a person’s mouth is changed by how much he has used it.

Finally, what a woman impure because of a stain must do. If it was found in her days of niddah, she keeps the seven days of a niddah because of the doubt. If it was found in her days of zivah, she treats herself as a minor or a major zavah, depending on the doubt. The entire structure, the Rambam reminds us, is Rabbinic.

In practice, many of these laws are applied today as they were refined by the Shulchan Aruch and its commentators, who differ from the Rambam on some details, such as whether a stain on the body and one on a garment are measured differently. A woman with a question asks a competent rav, and rabbis who are experienced in these matters are glad to be asked.

The Unifying Principle

Look at the whole chapter and a single instinct runs through it. A doubt that the Sages themselves created leans toward purity. The stain is a question, never a conviction. The law asks how large it is, where it is, what it rests on, what color the cloth is, who else was there, what she was doing, whether she checked, and whether it is even blood. At every step, a reasonable explanation is enough to release her.

But the chapter is just as firm about what leniency is not. It is not wishful thinking. Blood on her flesh below the belt cannot be blamed on a market whose blood would have hit her clothing first. A stain larger than a louse could make is not a louse. A wound on one part of the body does not explain a mark on another. The law will search hard for an innocent explanation, and it will not pretend that one exists when it does not.

That balance is the deeper lesson. The fence was built out of reverence for the Torah’s prohibition. The doors were built out of reverence for the woman, for her peace and for her home. A fence with no doors becomes a prison, and doors with no fence are only an open field. The Sages wanted neither.

Modern Application

Pirkei Avot teaches, in the words of Yehoshua ben Perachya, to judge every person on the side of merit. This chapter shows what that looks like when it is done properly. It is not a vague willingness to think well of people. It is a discipline. You ask where the mark is, what else could account for it, and whether the explanation genuinely fits. You do not invent a butchers’ market that nobody passed through. And you do not ignore one that everyone did.

There is a teaching attributed to the Baal Shem Tov that the world is a mirror, and that a fault a person notices in someone else is often a reflection of something in himself. Read beside this chapter, it suggests a question to ask before we decide that a stain we see on someone’s reputation came from within them. Did it come from the place they were passing through? From the work they had to handle? From a child who touched them with soiled hands? Very often the honest answer is yes.

And the same mercy applies inward. Many people treat every mark on their own record as proof of something rotten inside. The Rambam’s chapter suggests another posture: measure it, locate it, consider what it rests on, and if it can fairly be explained, let it go. Seriousness about holiness and gentleness toward a person can live in the same chapter.

The Closing

The Sages decreed that a stain should be taken seriously, and then they taught, halacha by halacha, how to take it seriously without taking it as a verdict.

Our Sages did not say to be stringent in these matters, only lenient. That is not a loophole in the law. It is the law telling us how it wants to be held.