What is the status of the fetus?
(כב) וְכִֽי־יִנָּצ֣וּ אֲנָשִׁ֗ים וְנָ֨גְפ֜וּ אִשָּׁ֤ה הָרָה֙ וְיָצְא֣וּ יְלָדֶ֔יהָ וְלֹ֥א יִהְיֶ֖ה אָס֑וֹן עָנ֣וֹשׁ יֵעָנֵ֗שׁ כַּֽאֲשֶׁ֨ר יָשִׁ֤ית עָלָיו֙ בַּ֣עַל הָֽאִשָּׁ֔ה וְנָתַ֖ן בִּפְלִלִֽים׃ (כג) וְאִם־אָס֖וֹן יִהְיֶ֑ה וְנָתַתָּ֥ה נֶ֖פֶשׁ תַּ֥חַת נָֽפֶשׁ׃ (כד) עַ֚יִן תַּ֣חַת עַ֔יִן שֵׁ֖ן תַּ֣חַת שֵׁ֑ן יָ֚ד תַּ֣חַת יָ֔ד רֶ֖גֶל תַּ֥חַת רָֽגֶל׃ (כה) כְּוִיָּה֙ תַּ֣חַת כְּוִיָּ֔ה פֶּ֖צַע תַּ֣חַת פָּ֑צַע חַבּוּרָ֕ה תַּ֖חַת חַבּוּרָֽה׃ {ס}
(22) When [two or more] parties fight, and one of them pushes a pregnant woman and a miscarriage results, but no other damage ensues, the one responsible shall be fined according as the woman’s husband may exact, the payment to be based on reckoning. (23) But if other damage ensues, the penalty shall be life for life, (24) eye for eye, tooth for tooth, hand for hand, foot for foot, (25) burn for burn, wound for wound, bruise for bruise.
דיני נפשות בפלוגתא דרבי ורבנן דתניא רבי אומר (שמות כא, כג) ונתת נפש תחת נפש ממון
In cases of capital law, the dispute concerning such a prohibition is with regard to the issue that is the subject of the dispute between Rabbi Yehuda HaNasi and the Rabbis, as it is taught in a baraita that Rabbi Yehuda HaNasi says with regard to that which is written: “If men struggle and they hurt a pregnant woman…and if there shall be a tragedy you shall give a life for a life” (Exodus 21:22–23), the reference is to a monetary payment for the life that he took. The tragedy referenced is the unintentional killing of the mother.
וְאִי מִיעַבְּרָא — עַד אַרְבָּעִים מַיָּא בְּעָלְמָא הִיא.
And if she is pregnant, until forty days from conception the fetus is merely water. It is not yet considered a living being.
(ד) הָאִשָּׁה שֶׁהִיא יוֹצְאָה לֵהָרֵג, אֵין מַמְתִּינִין לָהּ עַד שֶׁתֵּלֵד. יָשְׁבָה עַל הַמַּשְׁבֵּר, מַמְתִּינִין לָהּ עַד שֶׁתֵּלֵד.
(4) If a woman is about to be executed, they do not wait for her until she gives birth. But if she had already sat on the birthstool, they wait for her until she gives birth.
גמ׳ פשיטא גופה היא איצטריך ס"ד אמינא הואיל וכתיב (שמות כא, כב) כאשר ישית עליו בעל האשה ממונא דבעל הוא ולא ליפסדיה מיניה קמ"ל
GEMARA: Isn’t it obvious that the court executes the pregnant woman rather than waiting? After all, it is her body! The Gemara answers: It was necessary for the mishna to teach this, as it might enter your mind to say that since it is written: “And if men strive together, and hurt a woman with child, so that her offspring depart…he shall be fined, as the woman’s husband shall place upon him” (Exodus 21:22), the fetus is considered to be the property of the husband. If so, the court should wait until she gives birth before executing her, and not cause him to lose the fetus. Consequently, the mishna teaches us that the court does not take this factor into account.
רמבן תורת ואדם
לענין שמירת מצות מחללין עליו אמרה תורה חלל עליו שבת אחת שמא ישמור שבתות הרבה. הלכך אפילו בהצלת עובר פחות מבן ארבעים יום שאין בו חיות כלל מחללין כדעת בעל הלכות ז“ל.
Ramban Torat Ha'adam
As far as the observance of mitzvot is concerned, we would violate them for his (the fetus’s) sake, for the Torah says to violate one Shabbat for his sake, since if he is saved he will have the chance to observe many more Shabbatot. Therefore, even for the sake of a fetus that is less than forty days post-conception, that as of yet has no life to it at all, we would still violate the Shabbat, in accordance with the opinion of the author of Halachot Gedolot.
On ending a pregnancy
(ו) הָאִשָּׁה שֶׁהִיא מַקְשָׁה לֵילֵד, מְחַתְּכִין אֶת הַוָּלָד בְּמֵעֶיהָ וּמוֹצִיאִין אוֹתוֹ אֵבָרִים אֵבָרִים, מִפְּנֵי שֶׁחַיֶּיהָ קוֹדְמִין לְחַיָּיו. יָצָא רֻבּוֹ, אֵין נוֹגְעִין בּוֹ, שֶׁאֵין דּוֹחִין נֶפֶשׁ מִפְּנֵי נָפֶשׁ:
(6) If a woman is having trouble giving birth, they cut up the child in her womb and brings it forth limb by limb, because her life comes before the life of [the child]. But if the greater part has come out, one may not touch it, for one may not set aside one person's life for that of another.
יצא ראשו - באשה המקשה לילד ומסוכנת וקתני רישא החיה פושטת ידה וחותכתו ומוציאתו לאברים דכל זמן שלא יצא לאויר העולם לאו נפש הוא וניתן להורגו ולהציל את אמו אבל יצא ראשו אין נוגעים בו להורגו דהוה ליה כילוד ואין דוחין נפש מפני נפש
its head came out: With a women that is experiencing difficulty giving birth and is in [mortal] danger. And it is taught in the first section [of this teaching], "the midwife extends her hand and cuts it up and extracts [the pieces];" as the entire time that that it has not gone out into the air of the world, it is not [considered] a soul, and [so] it is possible to kill it and to save its mother. But when its head came out, we cannot touch it to kill it, as it is like a born [baby]; and we do not push off one soul for the sake of another.
(ט) אַף זוֹ מִצְוַת לֹא תַּעֲשֶׂה שֶׁלֹּא לָחוּס עַל נֶפֶשׁ הָרוֹדֵף. לְפִיכָךְ הוֹרוּ חֲכָמִים שֶׁהָעֻבָּרָה שֶׁהִיא מַקְשָׁה לֵילֵד מֻתָּר לַחְתֹּךְ הָעֵבָּר בְּמֵעֶיהָ בֵּין בְּסַם בֵּין בְּיָד מִפְּנֵי שֶׁהוּא כְּרוֹדֵף אַחֲרֶיהָ לְהָרְגָהּ. וְאִם מִשֶּׁהוֹצִיא רֹאשׁוֹ אֵין נוֹגְעִין בּוֹ שֶׁאֵין דּוֹחִין נֶפֶשׁ מִפְּנֵי נֶפֶשׁ וְזֶהוּ טִבְעוֹ שֶׁל עוֹלָם:
(9) This, indeed, is one of the negative mitzvot - not to take pity on the life of a rodef. On this basis, our Sages ruled that when complications arise and a pregnant woman cannot give birth, it is permitted to abort the fetus in her womb, whether with a knife or with drugs. For the fetus is considered a rodef of its mother. If the head of the fetus emerges, it should not be touched, because one life should not be sacrificed for another. Although the mother may die, this is the nature of the world.
Rabbi Mordechai Winkler, Levushei Mordekhai, Hoshen Mishpat 39 (1913)
Mental-health risk has been definitely equated with physical-health risk. This woman, in danger of losing her mental health unless the pregnancy is interrupted, would therefore accordingly qualify.
Rabbi Ben Zion Chai Uziel, Responsa Mishaptei Uziel 4:46 (1947-1964)
It is clear that abortion is not permitted without reason. That would be destructive and frustrative of the possibility of life. But for a reason, even if it is a slim reason, such as to prevent disgrace, then we have precedent and authority to permit it.
כשנשקפת סכנה לאשה בהמשכת ההריון יש להתיר הפלת העובר בשופי. גם כשמצב בריאותה של האשה רופף מאד ולשם רפואתה או השקטת מכאוביה הגדולים דרוש לבצע הפלת העובר, אע“פ שאין סכנה ממשית, גם כן יש מקום להתיר לעשות זאת, וכפי ראות עיני המורה המצב שלפניו.
Rabbi Eliezer Waldenberg, Tzitz Eliezer 9:51.3 (1967)
If there is a danger to the mother from continuing the pregnancy, one should permit abortion without hesitation. Also, if her health is poor and to cure her or to relieve her from great pain it is necessary to abort the fetus, even if she is not in actual danger, there is room to permit it, based on the halachic authority’s evaluation of the situation.
A Final Note
Tirzah Meacham, Jewish Women's Archive
In the last half of the twentieth century women’s voices still remain absent in the halakhic discussion on abortion. Those rabbis who preach the most stringent positions do not carry the pregnancies with all the physical stress and danger, bear unwanted or defective children, or bear the major burden of caring for them. Their stringencies, couched in moralistic terms, are played out on women’s bodies.