Si uno le da chalitzah a su yevamah, y su hermano se casó con su hermana y él murió, él le da chalitzah y no la toma en yibum. Del mismo modo, si uno se divorcia de su esposa, y su hermano se casó con su hermana y él murió, ella está exenta de chalitzah y yibum. [La gemara pregunta: "¿Lo mismo?" Diga, más bien: Pero si uno se divorcia de su esposa, etc. Para la hermana de la divorciada de uno está prohibida por la Torá, por lo que está exenta de jalá y de yibum, mientras que la hermana de la jalutza está prohibida solo por ordenanza de la escribas, por lo que recibe jalázah y no es tomada en yibum.]
Bartenura on Mishnah Yevamot
וכן המגרש את אשתו וכו' – In the Gemara (Tractate Yevamot 41a), it raises the question and similarly, you might think, but rather, I would say, that a man who divorces his wife, etc., that the sister of the divorced woman from the words of the Torah, and therefore is exempt from Halitzah and from levirate marriage, but the sister of the woman who underwent Halitzah, according to the words of the Scribes/Soferim, so therefore, she engages in Halitzah does not engage in levirate marriage.
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English Explanation of Mishnah Yevamot
Introduction
This mishnah continues to teach that it is forbidden to marry the sister of one’s halutzah.
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English Explanation of Mishnah Yevamot
If he performed halitzah for his yevamah, and his brother married her sister and died, she must perform halitzah but may not be taken in yibbum. If Reuven performs halitzah for Rachel (who had been married to Shimon) and then Levi marries Leah, Rachel’s sister, and then Levi dies, Leah now falls in front of Reuven for yibbum or halitzah. Since Leah is the sister of his halutzah, Rachel, Reuven cannot have yibbum with her. However, since the prohibition of the sister of one’s halutzah is only of rabbinic origin (derabbanan), she must have halitzah and is not totally exempt.
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English Explanation of Mishnah Yevamot
Similarly if a man divorces his wife and his brother marries her sister and dies behold she is exempt from halitzah and from yibbum. Similarly, if Reuven divorces Rachel, and Shimon marries Leah and then Shimon dies childless, Leah is exempt from both halitzah and yibbum, since she is the sister of his former wife. Since this is biblically prohibited, Leah does not even need to have halitzah.