הַמַּבְעִיר כָּל שֶׁהוּא חַיָּב. וְהוּא שֶׁיְּהֵא צָרִיךְ לָאֵפֶר. אֲבָל אִם הִבְעִיר דֶּרֶךְ הַשְׁחָתָה פָּטוּר מִפְּנֵי שֶׁהוּא מְקַלְקֵל. וְהַמַּבְעִיר גְּדִישׁוֹ שֶׁל חֲבֵרוֹ אוֹ הַשּׂוֹרֵף דִּירָתוֹ חַיָּב אַף עַל פִּי שֶׁהוּא מַשְׁחִית. מִפְּנֵי שֶׁכַּוָּנָתוֹ לְהִנָּקֵם מִשּׂוֹנְאוֹ וַהֲרֵי נִתְקָרְרָה דַּעְתּוֹ וְשָׁכְכָה חֲמָתוֹ וְנַעֲשָׂה כְּקוֹרֵעַ עַל מֵתוֹ אוֹ בַּחֲמָתוֹ שֶׁהוּא חַיָּב וּבְחוֹבֵל בַּחֲבֵרוֹ בִּשְׁעַת מְרִיבָה שֶׁכָּל אֵלּוּ מְתַקְּנִים הֵן אֵצֶל יִצְרָן הָרַע. וְכֵן הַמַּדְלִיק אֶת הַנֵּר אוֹ אֶת הָעֵצִים בֵּין לְהִתְחַמֵּם בֵּין לְהָאִיר הֲרֵי זֶה חַיָּב. הַמְחַמֵּם אֶת הַבַּרְזֶל כְּדֵי לְצָרְפוֹ בְּמַיִם הֲרֵי זֶה תּוֹלֶדֶת מַבְעִיר וְחַיָּב:
A person who kindles even the smallest fire is liable, provided he needs the ash that it creates. However, should a person kindle a fire with a destructive intent, he is not liable, for he is causing ruin. Nevertheless, a person who sets fire to a heap of produce or a dwelling belonging to a colleague is liable, because his intent is to take revenge on his enemies. [Through this act,] he calms his feelings and vents his rage. He is comparable to a person who rends his garments over a deceased person or in rage [on the Sabbath], or a person who injures a colleague in an argument. These individuals are all considered to be performing a constructive activity, because of their evil inclinations. Similarly, a person who lights a candle or wood, whether to generate warmth or light, is liable. A person who heats iron in order to strengthen it by submerging it in water is liable for [performing] a derivative [of the forbidden labor] of kindling.
