שׁוֹר שֶׁקְּשָׁרוֹ בְּעָלָיו בְּמוֹסֵרָה וְנָעַל בְּפָנָיו כָּרָאוּי וְיָצָא וְהִזִּיק. אִם תָּם הוּא מְשַׁלֵּם חֲצִי נֵזֶק. וְאִם הָיָה מוּעָד פָּטוּר שֶׁנֶּאֱמַר (שמות כא לו) "וְלֹא יִשְׁמְרֶנּוּ" הָא אִם שְׁמָרוֹ פָּטוּר וְשָׁמוּר הוּא זֶה. וְכֵן אִם הִזִּיק בְּדָבָר שֶׁהוּא מוּעָד לוֹ מִתְּחִלָּתוֹ כְּגוֹן שֶׁאָכַל דְּבָרִים הָרְאוּיִים לוֹ אוֹ שָׁבַר בְּרַגְלָיו בְּדֶרֶךְ הִלּוּכוֹ פָּטוּר מִלְּשַׁלֵּם:
[The following rules apply when] an ox breaks loose and causes damage after its owner had tied it with a rope and locked it [in a corral] in an acceptable manner. If it is a tam, he is required to pay only half the damages. If it is mu'ad, he is not liable at all, as [implied by Exodus 21:29]: "[If the owners were warned,] and they did not guard him." [One can infer that] if they did guard, they are not liable. [And in the above instance, the ox] was guarded.Similarly, if an ox caused damage through an activity for which he is mu'ad at the outset - e.g., it ate a type of food that it usually eats or it broke objects by treading on them - [the owner] is not liable [in the above instance].
