Mishnayos Niddah Perek 5 Mishnah 6

With regard to a girl who is eleven years and one day old, her vows are examined to ascertain whether she is aware of the meaning of her vow and in Whose name she vowed. Once she is twelve years and one day old and has grown two pubic hairs, which is a sign of adulthood, even without examination her vows are in effect. And one examines her vows throughout the entire twelfth year until her twelfth birthday. With regard to a boy who is twelve years and one day old, his vows are examined to ascertain whether he is aware of the meaning of his vow and in Whose name he vowed. Once he is thirteen years and one day old and has grown two pubic hairs, even without examination his vows are in effect. And one examines his vows throughout the entire thirteenth year until his thirteenth birthday. Prior to that time, eleven years and one day for a girl and twelve years and one day for a boy, even if they said: We know in Whose name we vowed and in Whose name we consecrated, their vow is not a valid vow and their consecration is not a valid consecration. After that time, twelve years and one day for a girl and thirteen years and one day for a boy, even if they said: We do not know in Whose name we vowed and in Whose name we consecrated, their vow is a valid vow and their consecration is a valid consecration.

בַּת אַחַת עֶשְׂרֵה שָׁנָה וְיוֹם אֶחָד, נְדָרֶיהָ נִבְדָּקִין. בַּת שְׁתֵּים עֶשְׂרֵה שָׁנָה וְיוֹם אֶחָד, נְדָרֶיהָ קַיָּמִין. וּבוֹדְקִין כָּל שְׁתֵּים עֶשְׂרֵה. בֶּן שְׁתֵּים עֶשְׂרֵה שָׁנָה וְיוֹם אֶחָד, נְדָרָיו נִבְדָּקִים. בֶּן שְׁלשׁ עֶשְׂרֵה שָׁנָה וְיוֹם אֶחָד, נְדָרָיו קַיָּמִין. וּבוֹדְקִין כָּל שְׁלשׁ עֶשְׂרֵה. קֹדֶם לַזְּמַן הַזֶּה, אַף עַל פִּי שֶׁאָמְרוּ יוֹדְעִין אָנוּ לְשֵׁם מִי נָדָרְנוּ, לְשֵׁם מִי הִקְדָּשְׁנוּ, אֵין נִדְרֵיהֶם נֶדֶר וְאֵין הֶקְדֵּשָׁן הֶקְדֵּשׁ. לְאַחַר הַזְּמַן הַזֶּה, אַף עַל פִּי שֶׁאָמְרוּ אֵין אָנוּ יוֹדְעִין לְשֶׁם מִי נָדָרְנוּ, לְשֶׁם מִי הִקְדָּשְׁנוּ, נִדְרָן נֶדֶר וְהֶקְדֵּשָׁן הֶקְדֵּשׁ: