Chullin, Chapter 4, Mishnah 3. This chapter continues to explore the relationship between a mother and the fetus she carries, and in particular the principle that the fetus is treated as a limb of its mother. Earlier the mishnah applied this to shechitah. Now it applies the same question to the laws of tumah: if the fetus has died inside its living mother, does that dead body transmit impurity to someone who touches it?
The Shepherd and the Animal's Fetus
"Behemah shemet ubarah betoch me'eha": an animal whose fetus expired while still lodged in her womb. "Vehoshit haro'eh et yado venaga bo": the shepherd put his hand in and made contact with that dead fetus. The verdict of the mishnah: "bein bibhemah teme'ah bein bibhemah tehorah, tahor." It makes no difference whether the mother belongs to a species that may be eaten, like a goat, or to one that may not, like a horse. In either situation the shepherd stays pure.
This is striking, since ordinarily a person who touches the carcass of a dead animal contracts tumah. Here he does not, because the dead fetus is not regarded as a body of its own. It is considered part of its mother, and the mother is very much alive. Something that counts as a piece of a living animal has no tumah to convey.
What is the source of this ruling? It rests on the teaching presented earlier in our chapter: when the mother is slaughtered properly, that shechitah permits the fetus within her too, precisely because halachah views the fetus as an extension of her body. Our case runs on the identical reasoning. So long as the dead fetus remains sealed inside her, it has no standing as a carcass in its own right; it is simply a portion of the living mother. Nothing about it can generate tumah, and the hand that touched it remains tahor.
Rabbi Yose HaGalili's Distinction
"Rabbi Yose HaGalili omer: bitme'ah, tamei, uvithorah, tahor." Rabbi Yose HaGalili disagrees, and he draws a line between the two kinds of animals. If the shepherd reached into a non-kosher animal and touched the dead fetus within her, he does become tamei.
His argument tracks the origin of the rule itself. We learned that a fetus counts as part of its mother from the halachah of shechitah, and shechitah applies only to species fit for eating. No such law exists for a horse or any other forbidden species, so there is no foundation for absorbing its fetus into the mother's body. That fetus stands as a corpse of its own, and whoever touches it becomes tamei. Where the species is one that shechitah does apply to, however, the principle genuinely holds, and there Rabbi Yose HaGalili concedes that the shepherd stays tahor.
The Midwife and the Human Fetus
The mishnah moves on to the human equivalent. "Ha'ishah shemet veladah betoch me'eha": a woman whose fetus died and has not yet left her body. "Ufashtah chayah et yadah venag'ah bo": the midwife put her hand inside and came into contact with it. The halachah is "hachayah teme'ah tum'at shiv'ah": she carries a seven day tumah, the same status as one who has had contact with a corpse, and this despite the fact that the fetus is still entirely inside.
Contact with a human corpse produces a tumah lasting seven days, and purification requires being sprinkled with the waters of the parah adumah. Strictly by Torah law, though, the midwife here bears no tumah whatsoever, for the identical reason we met in the animal case: the fetus is part of a living mother. The impurity assigned to her is derabbanan. Chachamim were troubled by a real possibility: perhaps the fetus had already pushed its head out and the midwife never noticed, in which case her touch would indeed have given her a seven day tumah min haTorah. Since that uncertainty hangs over every such situation, they ruled her tamei across the board.
The Mother Herself
"Veha'ishah tehorah ad sheyetzei havlad." The expectant mother stays pure as long as the child has not emerged. From the moment its head appears outside her, she acquires the complete tumah of a woman after childbirth, and that status comes from the Torah itself: it is the child's emergence that makes her tamei.
Why did Chachamim extend their decree to the midwife but not to the mother? Because the entire decree rests on the possibility of not noticing. The midwife may well be unaware that the head has already emerged and that she therefore touched it. The mother, by contrast, feels it when the head comes out. Since there is no comparable uncertainty in her case, Chachamim saw no reason to legislate.