Jerusalem Talmud Yevamot 1.4

משנה: בְּאֵי זֶה צַד אִם מֵתוּ הֵן צְרוֹתֵיהֶן מוּתָּרוֹת. הָיְתָה בִתּוֹ אוֹ אַחַת מִכָּל הָעֲרָיוֹת הָאֵילּוּ נְשׂוּאָה לְאָחִיו וְלוֹ אִשָּׁה אֲחֶרֶת מֵתָה בִתּוֹ אוֹ נִתְגָּרְשָׁה וְאַחַר כָּךְ מֵת אָחִיו צָרָתָהּ מוּתֶּרֶת. וְכָל הַיְּכוֹלָה לְמָאֵן וְלֹא מֵיאֵינָה וּמֵתָה צָרָתָהּ חוֹלֶצֶת וְלֹא מִתְיַבֶּמֶת.

MISHNAH: How are their co-wives permitted if they die? If his daughter or one of the incest-prohibited women was married to his brother who has another wife, if his daughter died and then his brother died her co-wife is permitted. And if a woman could repudiate but did not do so, when she died her co-wife performs ḥalîṣah but cannot be married in levirate.

הלכה: כֵּיצַד אִם מֵתוּ הֵן צְרוֹתֵיהֶן מוּתָּרוֹת כול׳. כֵּינִי מַתְנִיתָא כָּל הַיְּכוֹלָה לְמָאֵן וְלֹא מֵיאֵנָה וּמֵתָה צָרָתָהּ חוֹלֶצֶת וְלֹא מִתְיַבֶּמֶת.

HALAKHAH: “How are their co-wives permitted if they die,” etc. That is the Mishnah: “If a woman could repudiate but did not do so, when she died her co-wife performs ḥalîṣah but cannot be married in levirate.”