Reference for Keritot 2:4
הָאִשָּׁה שֶׁיָּלְדָה וְלָדוֹת הַרְבֵּה, הִפִּילָה בְתוֹךְ שְׁמוֹנִים נְקֵבָה וְחָזְרָה וְהִפִּילָה בְתוֹךְ שְׁמוֹנִים נְקֵבָה, וְהַמַּפֶּלֶת תְּאוֹמִים, רַבִּי יְהוּדָה אוֹמֵר, מְבִיאָה עַל הָרִאשׁוֹן וְאֵינָהּ מְבִיאָה עַל הַשֵּׁנִי. מְבִיאָה עַל הַשְּׁלִישִׁי וְאֵינָהּ מְבִיאָה עַל הָרְבִיעִי. אֵלּוּ מְבִיאִין קָרְבָּן עוֹלֶה וְיוֹרֵד. עַל שְׁמִיעַת הַקּוֹל, וְעַל בִּטּוּי שְׂפָתַיִם, וְעַל טֻמְאַת מִקְדָּשׁ וְקָדָשָׁיו, וְהַיֹּלֶדֶת, וְהַמְצֹרָע. וּמַה בֵּין הַשִּׁפְחָה לְבֵין כָּל הָעֲרָיוֹת. שֶׁלֹּא שָׁוְתָה לָהֶן לֹא בָעֹנֶשׁ וְלֹא בַקָּרְבָּן, שֶׁכָּל הָעֲרָיוֹת בְּחַטָּאת וְהַשִּׁפְחָה בְּאָשָׁם. כָּל הָעֲרָיוֹת בִּנְקֵבָה, וְשִׁפְחָה בְּזָכָר. כָּל הָעֲרָיוֹת, אֶחָד הָאִישׁ וְאֶחָד הָאִשָּׁה שָׁוִין בַּמַּכּוֹת וּבַקָּרְבָּן, וּבַשִּׁפְחָה לֹא הִשְׁוָה אֶת הָאִישׁ לָאִשָּׁה בַּמַּכּוֹת וְלֹא אֶת הָאִשָּׁה לָאִישׁ בַּקָּרְבָּן. כָּל הָעֲרָיוֹת, עָשָׂה בָהֶן אֶת הַמְעָרֶה כַגּוֹמֵר, וְחַיָּב עַל כָּל בִּיאָה וּבִיאָה. זֶה חֹמֶר הֶחְמִיר בַּשִּׁפְחָה, שֶׁעָשָׂה בָהּ אֶת הַמֵּזִיד כַּשּׁוֹגֵג:
[If] a woman has had multiple births and miscarried a female [fetus] within eighty days of the birth of a female [live child], and then she again miscarried a female within eighty days of the previous [miscarriage]; or if she miscarried twins, Rabbi Yehudah says: She brings [a sacrifice] for the first and not for the second, for the third but not for the fourth. The following [persons] bring an <i>Oleh veYored</i>: [One who] utters a [false] voice [oath denying testimony]; [one who makes] a false oath; one who [enters] the Temple [precincts] when impure or [who eats] sacred [food] when impure; a woman who has given birth; and the <i>Metzora</i>. What is the difference between [relations with] a <i>Shifchah Charufah</i> and all [other] forbidden unions? [The Torah] does not equate them either with regard to punishment or with regard to sacrifice. [Unintentional commission of] other forbidden unions [demands] a <i>Chattat</i>; and [relations with] a <i>Shifchah Charufah</i> [demands] an <i>Asham</i>. [The sacrifices brought in cases of] all forbidden unions [are] female animals; and [the sacrifice brought in the case of] a <i>Shifchah Charufah</i> is male. [In cases of] all forbidden unions both the man and the woman are equal with respect to lashes and the sacrifice; [in the case of] the <i>Shifchah Charufah</i> [the Torah] does not equate the man and the woman regarding the lashes, and [does not equate] the woman to the man regarding the sacrifice. [In cases of] all other forbidden unions sexual contact [is considered like] consummation, and one is liable for each act of intercourse. This a stringency that was applied to the <i>Shifchah Charufah</i> in that intentional transgression is [treated] like unintentional transgression.