Talmud for Yevamot 10:6

בֶּן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד, הוּא פוֹסֵל עַל יְדֵי אַחִין, וְהָאַחִים פּוֹסְלִין עַל יָדוֹ, אֶלָּא שֶׁהוּא פוֹסֵל תְּחִלָּה, וְהָאַחִין פּוֹסְלִין תְּחִלָּה וָסוֹף. כֵּיצַד, בֶּן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד שֶׁבָּא עַל יְבִמְתּוֹ, פָּסַל עַל יְדֵי אַחִין. בָּאוּ עָלֶיהָ אַחִין, וְעָשׂוּ בָהּ מַאֲמָר, נָתְנוּ גֵט אוֹ חָלְצוּ, פָּסְלוּ עַל יָדוֹ:

One (a yavam) of nine years and one day renders [the yavamah] unfit to the brothers [if he lives with her, for his act is considered "cohabitation." The same is true if he gives her a get or makes a ma'amar in her, both being valid (although his get is not a complete get, and his ma'amar is not a complete ma'amar.)], and his brothers render [her] unfit to him. But he renders unfit in the beginning, whereas his brothers render unfit in the beginning and in the end. [In the gemara it is explained that with a ma'amar, he renders unfit in the beginning, but not in the end. That is, if his older brother made a ma'amar and then he of nine years and one day made a ma'amar, he does not render her unfit to his brothers; but with cohabitation, he renders her unfit both in the beginning and in the end. Our Mishnah is elliptical, and is to be understood thus: "But he renders unfit (only) in the beginning, whereas they render unfit (both) in the beginning and in the end. When is this so? With a ma'amar, but with cohabitation, he renders unfit in the end, too. How so? etc."] How so? If he of nine years and one day cohabited with his yevamah, he renders her unfit to the brothers (who had made a ma'amar first). If the brothers lived with her, or made a ma'amar, or gave her a get or chalitzah, they render her unfit to him (even after he cohabited with her).

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