Mishnayos Yevamos Perek 9 Mishnah 1

There are women who are permitted to their husbands and forbidden to their yevamin, while others are permitted to their yevamin and forbidden to their husbands. Certain women are permitted both to these and to those, and others are forbidden to both these and to those. The mishna elaborates: And these are cases of women who are permitted to their husbands and forbidden to their yevamin: In the case of a common priest who married a widow, and he has a brother who is the High Priest, the widow, who was permitted to her husband, is forbidden to her yavam, as it is prohibited for the High Priest to marry a widow. The same is true in the case of a priest disqualified due to flawed lineage [ḥalal], e.g., the son of a priest and a divorcée, who married a woman fit to marry a priest, and he has a brother who is a priest fit for service. That woman was permitted to marry the ḥalal but is forbidden to his brother. Having engaged in intercourse with the ḥalal, she is rendered a ḥalala, a woman disqualified from marrying a priest. Another example is the case of an Israelite of unflawed lineage who married an Israelite woman of similar lineage, and he has a brother who is a son born from an incestuous or adulterous relationship [mamzer]; or a mamzer who married a daughter born from an incestuous or adulterous relationship [mamzeret], and he has a brother who is an Israelite of unflawed lineage. A mamzer is permitted to marry a mamzeret, but neither is per-mitted to a Jew of unflawed lineage. In each of these cases, these women are permitted to their husbands and forbidden to their yevamin.

יֵשׁ מֻתָּרוֹת לְבַעֲלֵיהֶן וַאֲסוּרוֹת לִיְבָמֵיהֶן, מֻתָּרוֹת לִיְבָמֵיהֶן וַאֲסוּרוֹת לְבַעֲלֵיהֶן, מֻתָּרוֹת לָאֵלּוּ וְלָאֵלּוּ, וַאֲסוּרוֹת לָאֵלּוּ וְלָאֵלּוּ. וְאֵלוּ מֻתָּרוֹת לְבַעֲלֵיהֶן וַאֲסוּרוֹת לִיְבָמֵיהֶן, כֹּהֵן הֶדְיוֹט שֶׁנָּשָׂא אֶת הָאַלְמָנָה וְיֶשׁ לוֹ אָח כֹּהֵן גָּדוֹל, חָלָל שֶׁנָּשָׂא כְשֵׁרָה וְיֶשׁ לוֹ אָח כָּשֵׁר, יִשְׂרָאֵל שֶׁנָּשָׂא בַת יִשְׂרָאֵל וְיֶשׁ לוֹ אָח מַמְזֵר, מַמְזֵר שֶׁנָּשָׂא מַמְזֶרֶת וְיֶשׁ לוֹ אָח יִשְׂרָאֵל, מֻתָּרוֹת לְבַעֲלֵיהֶן וַאֲסוּרוֹת לִיְבָמֵיהֶן: