156 Yevamot 10/6-9

(ו) 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:

(ז) בֶּן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד שֶׁבָּא עַל יְבִמְתּוֹ, וְאַחַר כָּךְ בָּא עָלֶיהָ אָחִיו שֶׁהוּא בֶן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד, פָּסַל עַל יָדוֹ. רַבִּי שִׁמְעוֹן אוֹמֵר, לֹא פָסַל:

(ח) בֶּן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד שֶׁבָּא עַל יְבִמְתּוֹ, וְאַחַר כָּךְ בָּא עַל צָרָתָהּ, פָּסַל עַל יְדֵי עַצְמוֹ. רַבִּי שִׁמְעוֹן אוֹמֵר, לֹא פָסָל. בֶּן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד שֶׁבָּא עַל יְבִמְתּוֹ, וּמֵת, חוֹלֶצֶת וְלֹא מִתְיַבֶּמֶת. נָשָׂא אִשָּׁה וּמֵת, הֲרֵי זוֹ פְטוּרָה:

(ט) בֶּן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד שֶׁבָּא עַל יְבִמְתּוֹ, וּמִשֶּׁהִגְדִּיל נָשָׂא אִשָּׁה אַחֶרֶת וּמֵת, אִם לֹא יָדַע אֶת הָרִאשׁוֹנָה מִשֶּׁהִגְדִּיל, הָרִאשׁוֹנָה חוֹלֶצֶת וְלֹא מִתְיַבֶּמֶת, וְהַשְּׁנִיָּה אוֹ חוֹלֶצֶת אוֹ מִתְיַבֶּמֶת. רַבִּי שִׁמְעוֹן אוֹמֵר, מְיַבֵּם לְאֵיזוֹ שֶׁיִּרְצֶה, וְחוֹלֵץ לַשְּׁנִיָּה. אֶחָד שֶׁהוּא בֶן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד, וְאֶחָד שֶׁהוּא בֶן עֶשְׂרִים שָׁנָה שֶׁלֹּא הֵבִיא שְׁתֵּי שְׂעָרוֹת:

(6) A boy from the age of nine years and one day disqualifies [his Yevama for Yibum] with his brothers, and his brothers disqualify her for him. But while he disqualifies her from the outset only, the brothers disqualify her from the outset and at the end. How so? [If] a boy the age of nine years and one day had relations with his Yevama [a woman whose husband died childless and whose brother-in-law must marry or dismiss her] he disqualifies [her] for his brothers. [If] [one of] the brothers had relations with her, or performed Ma’amar [semi-betrothal of a Yevama widow through money or a document] for her, or gave her a bill of divorce or underwent Chalitzah from her, they have disqualified [her] for him.

(7) [If] a boy the age of nine years and one day had relations with his Yevama after which his brother who was the age of nine years and one day had relations with her, [the latter] disqualifies [her] for him [the former]. Rabbi Shimon says: He does not disqualify [her].

(8) [If] a boy the age of nine years and one day had relations with his Yevama after which he had relations with her rival, he has disqualified [both women] from himself. Rabbi Shimon says: He does not disqualify [them]. [If] a boy the age of nine years and one day had relations with his Yevama after which he died, she performs Chalitzah but does not undergo Yibum. [If such a lad] married a woman and he died she is exempt [from Chalitzah and Yibum].

(9) [If] a boy the age of nine years and one day had relations with his Yevama and when he attained majority married a different woman and [then] dies, if he had not had relations with his Yevama after attaining majority the first one [the original Yevama] performs Chalitzah but does not undergo Yibum, while the second woman performs Chalitzah or undergoes Yibum. Rabbi Shimon says: He [a surviving Yavam] performs Yibum for whichever woman he wants, and undergoes Chalitzah from the other one. This is so whether he is nine years and one day or twenty years but has not grown two hairs [of puberty].