משנה: אַרְבָּעָה אָבוֹת נְזִיקִין הַשּׁוֹר וְהַבּוֹר וְהַמַּבְעֶה וְהַהֶבְעֵר. לֹא הַשּׁוֹר כַּהֲרֵי הַמַּבְעֶה וְלֹא הַמַּבְעֶה כַּהֲרֵי הַשּׁוֹר. לֹא זֶה וָזֶה שֶׁיֵּשׁ בָּהֶן רוּחַ חַיִים כַּהֲרֵי הָבּוֹר שֶׁאֵין בָּהּ רוּחַ חַיִים לֹא זֶה וָזֶה שֶׁדַּרְכָּן לֵילֵךְ וּלְהַזִּיק כַּהֲרֵי הָאֵשׁ שֶׁאֵין דַּרְכּוֹ לֵילֵךְ וּלְהַזִּיק. הַצַּד הַשָּׁוֶה שֶׁבָּהֶן שֶׁדַּרְכָּן לְהַזִּיק וּשְׁמִירָתָן עָלֶיךָ וּכְשֶׁהִזִּיק חָב הַמַּזִּיק לְשַׁלֵּם תַּשְׁלוּמֵי נֶזֶק בְּמֵיטַב הָאָרֶץ.
MISHNAH: There are four main categories of damages: The bull, and the pit, and the devourer, and the setting on fire. The bull is not like the devourer, nor the devourer like the bull; neither of them who are alive is like the pit which is not alive, nor either of them which move in causing damage is like the fire which does not move in causing damage. The common theme of them is that they are usually causing damage and you are obligated to watch them, and if damage was caused the person causing the damage is obligated to pay the damages in best quality land.