Mishnayos Niddah Perek 5 Mishnah 5

In the case of a boy, nine years and one day old, whose brother had died childless, who engaged in intercourse with his yevama, his brother’s widow, the status of the intercourse is that of halakhic intercourse and he acquires her as his wife; but he cannot give her a bill of divorce, if he chooses to end the marriage, until he reaches majority. And he becomes ritually impure after engaging in intercourse with a menstruating woman to the degree that he renders impure all the layers of bedding beneath him, such that they become impure like the upper bedding covering a zav. Accordingly, the bedding assumes first-degree ritual impurity status and does not become a primary source of ritual impurity, and it renders impure food and drink and does not render impure people and vessels. And if he is disqualified from the priesthood and the woman with whom he engages in intercourse is the daughter of a priest, he disqualifies her from partaking of teruma; but if he is a priest who marries an Israelite woman, he does not enable her to partake of teruma. And if he engages in bestiality, he disqualifies the animal from being sacrificed upon the altar, and the animal is stoned due to his act. And if he engaged in intercourse with one of all those with whom relations are forbidden, as stated in the Torah, e.g., his aunt or his mother, they are executed by the court due to having engaged in intercourse with him, because they are adults; but he is exempt, as he is a minor.

בֶּן תֵּשַׁע שָׁנִים וְיוֹם אֶחָד שֶׁבָּא עַל יְבִמְתּוֹ, קְנָאָהּ. וְאֵינוֹ נוֹתֵן גֵּט עַד שֶׁיַּגְדִּיל. וּמִטַּמֵּא בְנִדָּה, לְטַמֵּא מִשְׁכָּב תַּחְתּוֹן כָּעֶלְיוֹן. וּפוֹסֵל וְאֵינוֹ מַאֲכִיל בַּתְּרוּמָה. וּפוֹסֵל אֶת הַבְּהֵמָה מֵעַל גַּבֵּי הַמִּזְבֵּחַ, וְנִסְקֶלֶת עַל יָדוֹ. וְאִם בָּא עַל אַחַת מִכָּל הָעֲרָיוֹת הָאֲמוּרוֹת בַּתּוֹרָה, מוּמָתִים עַל יָדוֹ, וְהוּא פָטוּר: