Mishnayos Bava Kamma Perek 4 Mishnah 2

With regard to an ox that is forewarned with regard to its own species, as it already gored other oxen three times, but is not forewarned with regard to other species; or an ox that is forewarned with regard to people, but is not forewarned with regard to animals; or one that is forewarned with regard to small specimens of a species, but is not forewarned with regard to large specimens of that species; in all these cases, if the ox gores the type of animal or person with regard to which it is forewarned, its owner pays the full cost of the damage, and if it gores an animal or person with regard to which it is not forewarned, he pays half the cost of the damage. The Sages said before Rabbi Yehuda: What would be the halakha if this ox is forewarned with regard to Shabbatot but is not forewarned with regard to weekdays? He said to them: For damage it causes on Shabbatot its owner pays the full cost of the damage, and for damage it causes on weekdays, he pays half the cost of the damage. When is it rendered innocuous again after being forewarned with regard to Shabbat? It reverts to its innocuous status when its behavior reverts to normal, i.e., when it refrains from goring for three days of Shabbat, i.e., Shabbat in three successive weeks.

שׁוֹר שֶׁהוּא מוּעָד לְמִינוֹ וְאֵינוֹ מוּעָד לְשֶׁאֵינוֹ מִינוֹ, מוּעָד לְאָדָם וְאֵינוֹ מוּעָד לִבְהֵמָה, מוּעָד לִקְטַנִּים וְאֵינוֹ מוּעָד לִגְדוֹלִים, אֶת שֶׁהוּא מוּעָד לוֹ מְשַׁלֵּם נֶזֶק שָׁלֵם, וְאֶת שֶׁאֵינוֹ מוּעָד לוֹ מְשַׁלֵּם חֲצִי נֶזֶק. אָמְרוּ לִפְנֵי רַבִּי יְהוּדָה, הֲרֵי שֶׁהָיָה מוּעָד לְשַׁבָּתוֹת וְאֵינוֹ מוּעָד לְחֹל. אָמַר לָהֶם, לַשַּׁבָּתוֹת מְשַׁלֵּם נֶזֶק שָׁלֵם, לִימוֹת הַחֹל מְשַׁלֵּם חֲצִי נֶזֶק. אֵימָתַי הוּא תָם. מִשֶּׁיַּחֲזֹר בּוֹ שְׁלשָׁה יְמֵי שַׁבָּתוֹת: