The Rambam · Sefer Zemanim
הלכות שבת ט׳Sabbath 9
Chapter 9 of 30 in Sabbath — 20 halachot
Halacha 1א׳
הָאוֹפֶה כִּגְרוֹגֶרֶת חַיָּב. אֶחָד הָאוֹפֶה אֶת הַפַּת אוֹ הַמְבַשֵּׁל אֶת הַמַּאֲכָל אוֹ אֶת הַסַּמְמָנִין אוֹ הַמְחַמֵּם אֶת הַמַּיִם הַכּל עִנְיָן אֶחָד הוּא. שִׁעוּר הַמְחַמֵּם אֶת הַמַּיִם כְּדֵי לִרְחֹץ בָּהֶן אֵיבָר קָטָן. וְשִׁעוּר מְבַשֵּׁל סַמְמָנִין כְּדֵי שֶׁיִּהְיוּ רְאוּיִין לְדָבָר שֶׁמְּבַשְּׁלִין אוֹתָן לוֹ:
One who bakes [something] the size of a dried fig is liable. It is the same whether he bakes bread, cooks a food or herbs or heats up water – it all has one function. The [requisite] amount of heating water is enough to bathe a small limb. And the [requisite] amount of cooking herbs is enough that they be fit for the purpose for which they are being cooked.
Halacha 2ב׳
הַנּוֹתֵן בֵּיצָה בְּצַד הַמֵּיחַם בִּשְׁבִיל שֶׁתִּתְגַּלְגֵּל וְנִתְגַּלְגְּלָה חַיָּב. שֶׁהַמְבַשֵּׁל בְּתוֹלֶדֶת הָאוּר כִּמְבַשֵּׁל בָּאוּר עַצְמָהּ. וְכֵן הַמֵּדִיחַ בְּחַמִּין דָּג מָלִיחַ הַיָּשָׁן אוֹ קוּלְיָיס הָאִסְפָּנִין וְהוּא דָּג דַּק וְרַךְ בְּיוֹתֵר הֲרֵי זֶה חַיָּב. שֶׁהֲדָחָתָן בְּחַמִּין זֶה הוּא גְּמַר בִּשּׁוּלָן. וְכֵן כָּל כַּיּוֹצֵא בָּהֶן:
One who places an egg next to an urn so that it will roast slightly and it becomes slightly roasted is liable – since one who cooks with an effect of fire is like one who cooks with fire itself. Likewise one rinses an old salted fish or a Spanish kolias – which is a very small and delicate fish – in hot water is surely liable. For scalding in hot water is the completion of its cooking. And likewise anything that is similar to this.
Halacha 3ג׳
הַמַּפְקִיעַ אֶת הַבֵּיצָה בְּבֶגֶד חַם אוֹ בְּחוֹל וּבַאֲבַק דְּרָכִים שֶׁהֵן חַמִּים מִפְּנֵי הַשֶּׁמֶשׁ אַף עַל פִּי שֶׁנִּצְלֵית פָּטוּר. שֶׁתּוֹלְדוֹת חַמָּה אֵינָם כְּתוֹלְדוֹת הָאֵשׁ. אֲבָל גָּזְרוּ עֲלֵיהֶן מִפְּנֵי תּוֹלְדוֹת הָאוּר. וְכֵן הַמְבַשֵּׁל בְּחַמֵּי טְבֶרְיָה וְכַיּוֹצֵא בָּהֶם פָּטוּר. הַמְבַשֵּׁל עַל הָאוּר דָּבָר שֶׁהָיָה מְבֻשָּׁל כָּל צָרְכּוֹ אוֹ דָּבָר שֶׁאֵינוֹ צָרִיךְ בִּשּׁוּל כְּלָל פָּטוּר:
One who cracks an egg on a hot garment or sand or dirt of the roads which are hot because of the heat of the sun is exempt, even though it gets roasted. For the effects of the sun are not like the effects of fire [regarding that which is defined as cooking]. But they decreed about them [to forbid them] on account of the effects of fire. Likewise one who cooks with the hot springs of Tiberius or that which is similar to them is exempt. One who cooks something that is totally cooked or something that does not need to be cooked at all on the fire is exempt.
Mishneh Torah, Torat Emet 363 edition, via Sefaria — public domain
English: Sefaria Edition, tr. R. Francis Nataf, 2019 — CC BY