(ו) שֹׁפֵךְ֙ דַּ֣ם הָֽאָדָ֔ם בָּֽאָדָ֖ם דָּמ֣וֹ יִשָּׁפֵ֑ךְ כִּ֚י בְּצֶ֣לֶם אֱלֹקים עָשָׂ֖ה אֶת־הָאָדָֽם׃
(6) One who sheds the blood of mankind by man shall his blood will be shed; for in the image of God made He man.
ראה שישראל הוא ובן ברית הוא והתורה אמרה (בראשית ט, ו) שופך דם האדם באדם דמו ישפך אמרה תורה הצל דמו של זה בדמו של זה
'See, he is an Israelite, and a son of the covenant, whilst the Torah hath said, Whosoever would shed the blood of a man, [to save] that man shall his own blood be shed, meaning, save the blood of the pursued by the blood of the pursuer'!
(22) And if men fight each other, and hurt a pregnant woman, so that her child departs, and yet no tragic [death of the mother] follow, he shall be surely fined, according as the woman’s husband shall lay upon him; and he shall pay as the judges determine. (23) But if any harm follow, then thou shalt give life for life, (24) eye for eye, tooth for tooth, hand for hand, foot for foot, (25) burning for burning, wound for wound, stripe for stripe.
If a priest's daughter was married to an Israelite who died, she may perform her ritual immersion and eat terumah the same evening! R. Hisda replied: ... She performs the immersion but may eat terumah only until the fortieth day. For if she is not found pregnant she never was pregnant; and if she is found pregnant, until the fortieth day [the embryo] is only a mere fluid.
אמרו אף על העוברין מאי טעמיה דרבי ישמעאל דכתיב (בראשית ט, ו) שופך דם האדם באדם דמו ישפך איזהו אדם שהוא באדם הוי אומר זה עובר שבמעי אמו
They said [a Ben Noach is killed] even when s/he [kills] fetuses. What's the reason? Because it is written whoever sheds the blood of a person inside of a person his blood shall be spilled. What is a person inside of a person? It's a fetus in the womb of his mother.
(ז) וַיִּיצֶר֩ ה אֱלֹקים אֶת־הָֽאָדָ֗ם עָפָר֙ מִן־הָ֣אֲדָמָ֔ה וַיִּפַּ֥ח בְּאַפָּ֖יו נִשְׁמַ֣ת חַיִּ֑ים וַֽיְהִ֥י הָֽאָדָ֖ם לְנֶ֥פֶשׁ חַיָּֽה׃
(7) Then YHVH God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul.
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 ואמאי רודף הוא שאני התם משמיא קא רדפי לה
[In the case of] a pregnant woman [who is in mortal danger during childbirth, she may] extend her hand and cut up [her fetus] and remove it limb by limb, for as long as it has not emerged to the world, it is not a nefesh [soul] and it is permitted to kill it and to save its mother. But if its head has emerged, one may not touch it to kill it, for it is as living offspring, and one does not set aside one nefesh for another... [at that point] she is being pursued by Heaven.
(ט) אף זו מצות לא תעשה שלא לחוס על נפש הרודף. לפיכך הורו חכמים שהעוברה שהיא מקשה לילד מותר לחתוך העובר במיעיה. בין בסם בין ביד מפני שהוא כרודף אחריה להורגה. ואם משהוציא ראשו אין נוגעין בו שאין דוחין נפש מפני נפש וזהו טבעו של עולם.
(9) ... It is a negative commandment that one should not protect the life of a rodef (pursuer). For this reason, the sages ruled that in the case of a pregnant woman in a dangerous labor, it is permissible to dismember the fetus in her womb - whether with a drug or by hand because it is like a rodef pursuing her to kill her. However, once his head has emerged one may not touch him, as we do not set aside one nefesh [soul] for another, and this is the natural way of the world.