סימן יט סעיף ב
טָעָה וְלֹא אָמַר מַשִּׁיב הָרוּחַ וּמוֹרִיד הַגָּשֶׁם, אִם נִזְכַּר קוֹדֶם שֶׁאָמַר הַבְּרָכָה מְחַיֵּה הַמֵּתִים אוֹמֵר בַּמָּקוֹם שֶׁנִּזְכַּר רַק שֶׁלֹּא יְהֵא בְּאֶמְצַע עִנְיָן, כְּגוֹן אִם נִזְכַּר לְאַחַר שֶׁאָמַר וּמְקַיֵּם אֱמוּנָתוֹ, אוֹמֵר גַּם כֵּן לִישֵׁנֵי עָפָר, וְאוֹמֵר מַשִּׁיב הָרוּחַ וְכוּ' מִי כָמוֹךָ וְכוּ' וְאִם רוֹצֶה יָכוֹל לוֹמַר לְגַמְרֵי מַשִּׁיב הָרוּחַ וּמוֹרִיד הַגָּשֶׁם מְכַלְכֵּל חַיִּים וְכוּ', אֲבָל אִם לֹא נִזְכַּר עַד לְאַחַר שֶׁסִּיֵּם הַבְּרָכָה מְחַיֵּה הַמֵּתִים צָרִיךְ לַחְזֹר לְרֹאשׁ תְּפִלַּת שְׁמֹנֶה עֶשְׂרֵה (וְלֹא סָגֵי שֶׁיַּתְחִיל אַתָּה גִּבּוֹר כִּי גּ' בְּרָכוֹת הָרִאשׁוֹנוֹת כְּחַדָּא חֲשִׁיבִי לְעִנְיָן זֶה, שֶׁאִם סִיֵּם הַבְּרָכָה שֶׁלֹּא כַּהֹגֶן צָרִיךְ לַחְזֹר לְרֹאשׁ הַתְּפִלָּה) (סִימָן קי"ד) טָעָה בְּמַעֲרִיב שֶׁל פֶּסַח אוֹ בְּשַׁחֲרִית אוֹ בְּמוּסָף וְלֹא אֲמָרוֹ, אֵין צָרִיךְ לַחֲזוֹר.
If by mistake you did not say: mashiv haruach umorid hageshem, if you remembered before you completed the berachah mechaye hameisim, then you may say it at the place you remembered, but only if you are not in mid-phrase. For instance, if you remembered after you said: umekayim emunaso, (and fulfiller of His faithfulness) [you continue and] say also i. e. lisheinei afar (to those who sleep in the dust) and [then] you say mashiv haruach … [and continue] mi chamocha … (who is like You). If you prefer, you may repeat the whole paragraph, that is, mashiv haruach umorid hageshem, and then continue: mechalkeil chaim … But, if you did not remember [the omission] until after you completed the berachah: mechayei hameisim, you are required to return to the beginning of Shemoneh Esrei.3According to Mishnah Berurah, however, if you have not yet said attah kadosh, you may say mashiv haruach and then continue with attah kadosh. (And it will not suffice to begin [again] [from] atah gibor (You are mighty), because the first three berachos are considered as one [unit] in this regard, [meaning] that if you completed [any] berachah [of these three] improperly, you must return to the beginning of Shemoneh Esrei. If by error during the Ma'ariv service of Pesach or during the Shacharis service or during Musaf you failed to say it (mashiv haruach), you need not return to the beginning to say it.4This is because as soon as Pesach arrives, at Maariv, mashiv haruach should be discontinued. However, it is preferable to wait for Musaf when the chazzan’s public omission will serve as the “announcement” that mashiv haruach is no longer said. But this is only “preferable”; in the absence of the “announcment” the berachah is not invalidated. (Derech Hachayim.)
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.)