סימן צח סעיף כו

מֻתָּר לְכַסּוֹת אֶת הָאֵשׁ בִּכְלִי אוֹ בְּאֵפֶר מוּכָן (עַיֵן לְקַמָּן סִימָן צ"ט סָעִיף ד). וְאַף עַל פִּי שֶׁאֶפְשָׁר שֶׁיִּכָּבֶה קְצָת עַל יְדֵי הַכִּסּוּי, מִכָּל מָקוֹם כֵּיוָן שֶׁאֵינוֹ מְכַוֵּן לְכִבּוּי (וְגַם הֲוֵי מְלָאכָה שֶׁאֵינָהּ צְרִיכָה לְגוּפָהּ), מֻתָּר לְצֹרֶךְ יוֹם טוֹב. וְדַוְקָא לְצֹרֶךְ אוֹתוֹ הַיּוֹם. אֲבָל לְצֹרֶךְ הַלַּיְלָה אָסוּר דְּהָא הַלַּיְלָה שַׁיָּךְ לְיוֹם שֵׁנִי.

It is permitted to cover a fire (on Yom Tov)⁷⁶To preserve the fire for later use. with a vessel or ashes that have been prepared (before Yom Tov).⁷⁷See Chapter 99:4. Even though it may be slightly extinguished by being covered,⁷⁸Vilna Gaon. Even though you are allowed to roast meat on coals, which will surely extinguish some of the coals, in that case, it is done for the immediate preparation of food, while, here, you are merely preserving it for later preparation; and therefore it is forbidden, if extinguishing it is inevitable (Magein Avraham). But some poskim permit this, even though you will inevitably extinguish part of it, since this is not your intention and is for the sake of food preparations (Peri Chadash, Reshal). The Mishnah Berurah 502:9 mentions both opinions. nevertheless since your intention is not to extinguish it, (and it is a melachah not needed for its own sake),⁷⁹And is, therefore, not a de’oraisa violation according to most poskim. it is permitted for the needs of the Yom Tov. But it is permitted only when you need it for that day. But for the needs of the (following) night it is forbidden, for the night belongs to the second day.

תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן העולם הבא שנאמר הליכות עולם לו אל תקרי הליכות אלא הלכות (נדה ע"ג.)