Mishnayos Bava Kamma Perek 4 Mishnah 4

If an ox of a halakhically competent person gored an ox of a deaf-mute, an imbecile, or a minor, all of whom are not considered halakhically competent, the owner is liable for damages. But if an ox of a deaf-mute, an imbecile, or a minor gored an ox of a halakhically competent person, the owner of the ox is exempt from liability. If an ox belonging to a deaf-mute, an imbecile, or a minor gored another ox and caused damage, the court appoints a steward for them and warns them with regard to the ox that gored in the presence of the steward. The ox is thereby rendered a forewarned ox, since the steward is considered its owner with regard to the requirement of the verse: “And warning has been given to its owner” (Exodus 21:29). If, after the ox was rendered forewarned in this manner, the deaf-mute regained his hearing, the imbecile became halakhically competent, or the minor reached the age of majority, the ox has thereby reverted to its status of innocuousness. This is the statement of Rabbi Meir, who maintains that the ox had the status of a forewarned ox only while it was under the custody of the steward. Rabbi Yosei says: It retains its previous status of being forewarned. If a stadium [ha’itztadin] ox, i.e., one that is trained to fight in a stadium, gores and kills a person, it is not liable to be put to death, as it is stated: “And if an ox gores a man or a woman” (Exodus 21:28). This is referring only to an ox that gores on its own initiative, but not to the case of an ox where others induced it to gore. Therefore, the owner of a stadium ox, which is trained to gore, is exempt from liability if it does.

שׁוֹר שֶׁל פִּקֵּחַ שֶׁנָּגַח שׁוֹר שֶׁל חֵרֵשׁ, שׁוֹטֶה וְקָטָן, חַיָּב. וְשֶׁל חֵרֵשׁ, שׁוֹטֶה וְקָטָן, שֶׁנָּגַח שׁוֹר שֶׁל פִּקֵּחַ, פָּטוּר. שׁוֹר שֶׁל חֵרֵשׁ, שׁוֹטֶה וְקָטָן שֶׁנָּגַח, בֵּית דִּין מַעֲמִידִין לָהֶן אַפּוֹטְרוֹפּוֹס וּמְעִידִין לָהֶן בִּפְנֵי אַפּוֹטְרוֹפּוֹס. נִתְפַּקַּח הַחֵרֵשׁ, נִשְׁתַּפָּה הַשּׁוֹטֶה וְהִגְדִּיל הַקָּטָן, חָזַר לְתַמּוּתוֹ, דִּבְרֵי רַבִּי מֵאִיר. רַבִּי יוֹסֵי אוֹמֵר, הֲרֵי הוּא בְחֶזְקָתוֹ. שׁוֹר הָאִצְטָדִין אֵינוֹ חַיָּב מִיתָה, שֶׁנֶּאֱמַר (שמות כא) כִּי יִגַּח, וְלֹא שֶׁיַּגִּיחוּהוּ: