What the Torah Calls Blood

The Hook

Chapter five of Hilchot Issurei Biah opens with two rulings that sound uncompromising. A woman becomes impure even when the bleeding was brought on by something outside her control, and she becomes impure from a drop of blood no larger than a mustard seed, exactly as if a great deal had flowed. It would be easy to expect the rest of the chapter to tighten the net further.

It does the opposite. Page after page, the Rambam narrows the definition of what counts. Only blood, and only certain colors of blood. Only from one specific place. Only in the ordinary way a woman's body works. A stain lighter than ink is pure. Blood from a wound is pure. Blood that comes with urine is pure. Bleeding at the beginning of a marriage, for a defined time, is pure. Why would a law that is so strict about the smallest drop be so careful about what it agrees to call a drop at all?

Seeing Is Not Enough

The opening rulings establish the seriousness of the category. If a woman jumped from place to place, or was otherwise affected and began bleeding, she is impure. The Torah does not ask why the blood came. It asks only whether it came. And quantity does not matter: the smallest drop renders her impure as fully as a flow. Even blood that has not yet left her body, once it has reached a certain point within, makes her impure, as the verse says, a discharge of blood within her flesh.

But immediately the Rambam turns to a different question. Where did the blood come from? Drawing on his own medical knowledge, he explains the Sages' language for the inner anatomy of a woman, expressed, as he says, in metaphor: the room, where life is formed; the antechamber, the gateway to the room; the loft above them; and the passageway between the loft and the antechamber. The Sages chose the language of a house, and the Rambam preserves their modesty while explaining their meaning.

Blood from the room renders her impure, except for the blood of purity the Torah declared pure after childbirth. Blood from the loft is entirely pure, like blood from a wound in the liver or a kidney. And blood found in the antechamber depends on exactly where it is found. Found deep within, it is presumed to come from the room, and she is impure by Torah law. Found closer to the outside, it may have come from either place, and she is impure because of doubt, so that the stricter consequences of Torah impurity are not applied. The commentators add that in practice she is forbidden to her husband wherever the blood is found.

The point is subtle but essential. Niddah is not about bleeding in general. It is about blood from one source, the place the Sages called the source, where a child is formed. The impurity is attached to the place of life itself.

Five Colors and a Hand Against the Sun

Next the Rambam narrows the definition again. Not every fluid from the source renders a woman impure, only blood, as the verse says, a discharge of blood. A white or green fluid, even if it is thick like blood, is pure. And not every shade of blood counts. There are five: red, black, bright saffron, the color of muddy water, and the color of diluted wine. All other colors are pure.

Each is defined with almost scientific care. Red is the color of the first blood drawn in bloodletting, placed in a cup. Black is like dried ink. Saffron is compared to a particular leaf of a fresh plant still in its soil. Muddy water is made from a specific reddish earth stirred into water to a certain depth. Diluted wine is one part fresh wine of the Sharon to two parts water. A stain darker than one of the first four is impure; lighter, such as a black like an olive or a raven, is pure. For diluted wine, only the exact shade counts.

Then comes a beautiful image. The sage holds the cloth in his hand, stands in the sunlight, and shades the stain with his other hand so he can see it as it truly is. The cloth must be white; the cup must be wide and thin so that light enters it. And yet, the Rambam adds, a sage does not need to do all this every time. Over years he develops a sensitive eye, and he knows at a glance. Only when he is in doubt does he bring out the ink and the cup.

The Baal Shem Tov taught that everything a person sees and hears is meant as a lesson for his service of God. Here the lesson is about seeing itself. To see truly, you need the right light and the right shade. Too much glare washes out the truth; too much shadow hides it. A person must stand in the sun and still shield his eyes.

And again the trust returns to the woman. If she says, I had a stain of such and such a color and I lost it, her word is accepted, and the sage rules on the basis of her description. The commentators note one limit: if a stain clearly looks like blood, she is not believed when she says that a sage once declared such a stain pure. Her description is trusted; a claimed ruling must be heard from the sage himself.

What Is Not Niddah

The final movement is a long list of things that are not the blood of niddah. A piece of tissue discharged without blood is pure, and even blood within it is the tissue's own blood, not hers. Small particles that look red are placed in lukewarm water: if they dissolve, it was congealed blood and she is impure; if they do not dissolve after a full day, they came from a wound and she is pure. Blood passed through a tube placed within is pure, because the verse speaks of a discharge within her flesh, the ordinary way a woman's body functions, and this is not the ordinary way. Blood that comes with urine is pure, even if she felt a sensation, because the source of urine is not the source of life.

The Alter Rebbe, in his Shulchan Aruch, takes care to explain the reason for the ruling on the tube. The leniency is not a technicality about the tube standing between the blood and her body. It is because this is simply not how a woman's body discharges blood. The Torah's category is defined by the nature of the body, not by a loophole.

Finally the chapter turns to the beginning of a marriage. Hymeneal bleeding is pure. It is not niddah or zivah, because it does not come from the source; it is the blood of a wound. The Rambam then distinguishes by a young woman's age and whether she had menstruated before marriage, granting a defined period during which bleeding is attributed to the wound, until it heals. He explains how one knows that the wound has healed, and he teaches that if there was no bleeding at first and then bleeding came later, it is presumed to be ordinary menstrual bleeding, since hymeneal bleeding would have appeared at the start. The commentators emphasize that the Jewish people later accepted upon themselves a stringency here, so that today such bleeding is treated with the full requirement of seven clean days.

The Unifying Principle

What unites a chapter that begins with a mustard seed and ends with a wound? The Torah's definition of niddah is sharp at both ends. When the blood truly comes from the source of life, nothing reduces it: not its size, not its cause, not whether it has left the body. When it does not come from that source, nothing makes it impure: not its redness, not its amount, not the moment it appears.

Many commentators, and Chassidic thought in particular, explain that impurity in the Torah arises where life, or the potential for life, has departed. The most severe impurity is that of death. Niddah is a quieter echo of the same idea: a potential for new life that was prepared and did not come to be. That is why the law attaches impurity to the room and not to the loft, to the source and not to a wound, to the body's natural cycle and not to a tube or a cut. The Torah is not repelled by the body. It honors the place where life begins, and it marks with great precision the moment when that potential has passed.

That is also why the chapter is filled with sages and their eyes. A boundary this precise cannot be drawn by worry or by guesswork. It must be read, in the right light, by someone trained to see.

Modern Application

Two habits of mind come from this chapter. The first is that a holy boundary is drawn exactly, neither looser nor tighter than the Torah drew it. A person who treats every doubt as impure has not become more pious; he has stopped reading. A person who treats every doubt as pure has stopped caring. The Torah asks us to look carefully.

The second is that we are not meant to read alone. The Mishnah in Avot teaches, make for yourself a rav, and the Lubavitcher Rebbe often urged people to take this literally, to have a rav to whom they bring their questions, rather than deciding on their own what is permitted. Nowhere is that more true than in the laws of this chapter. In our own time, as the commentators note, we no longer rely on the fine distinctions between shades of red, and any stain with a reddish tint is treated as impure. Questions about other colors are still brought to a sage, and many communities now have trained rabbis and women advisors who answer them with knowledge and great sensitivity.

There is also a lesson here about our inner lives. The Alter Rebbe in Tanya teaches that a thought which rises unbidden in a person's mind is not the person himself; it comes from the animal soul, and the beinoni's task is not to be shocked by it but to push it away and return to who he truly is. The Rambam's careful sorting of what comes from the source and what is only a wound is a model for that kind of honesty. Not every mark on the cloth is what it first seems, and not every hurt defines us. It takes light, patience and sometimes another person's trained eye to tell the difference.

There is real kindness in this system. A woman is not left alone with a stain and a worry. Her word is trusted, her doubts are taken seriously, and a person trained to see stands ready to answer. The law that is strict about the source of life is equally careful not to burden her with what is not.

The Closing

A chapter that seems at first to be about blood is really about truth: where something comes from, what it truly is, and who is qualified to see it. The sage stands in the sun with his hand raised over the cloth, so that the light will show what is there and nothing more.

The Torah guards the source of life without compromise, and it refuses to call anything else by that name. To see clearly, stand in the light, shade your eyes, and ask someone who knows how to look.