Audio by Ushy Fried

76:20 One who erred and started a week day prayer on Shabbat, this is a bad omen for one. One should examine one's deeds during all the day of the week to come and repent. מי שטעה והתחיל תפלה של חול בשבת סימן רע לו ויפשפש במעשיו כל ימי השבוע הבאה ויעשה תשובה
76:21 One who erred during the intermediate blessing of the Shabbat (Shemoneh Esreh) prayers between different services. 1 If one remembered before one said G-d's name at the end of the blessing, one returns to the beginning of the blessing for (the prayers) one should be saying now, but if one did not remember until after one said G-d's name, one finishes and says ''Who hallows the Sabbath'' and fulfills one's obligation after the event, because the essence of the intermediate blessings is (the paragraph) ''be pleased with our rest'' which is the same in all the (Shabbat Shemoneh Esreh) prayers.

1) For example, if instead of saying the blessing for the evening prayers, one said the blessing for the morning prayers.

טעה בברכה אמצעית של תפלות השבת מזו לזו אם נזכר קודם שאמר את השם מחתימת הברכה חוזר לתחלת הברכה שהיה לו להתפלל עתה אבל אם לא נזכר עתה עד לאחר שאמר את ה' גומר ואומר מקדש השבת ויוצא בדיעבד לפי שהעיקר מברכות האמצעיות היא רצה נא במנוחתנו והיא שוה בכל התפלות

76:22 When does the above apply ? In the evening, morning and afternoon prayers. However, in the additional prayers if one prayed instead of this 1 another prayer, 2 one does not fulfill one's obligation, since one did not mention the additional sacrifice. 3 Similarly, if in place of the (intermediate blessing of) evening or morning or afternoon prayers one prayed (the intermediate blessing) of the additional prayers, one does not fulfill one's obligation, since by mentioning the additional sacrifice, one said a false statement before G-d, 4 blessed be He. 5

1) The intermediate blessing for the additional prayers. 2) Another intermediate prayer from a different service. 3) If one realizes one's error before saying the second ''May the words of my mouth...'' at the end of the additional prayers, one should return to the beginning of the intermediate blessing. If one has already said that ''May the words of my mouth...'', one must return to the beginning and say the whole addtional prayers (see the footnote on Law 18). The Mishna Berurah (268:16) quotes the Chayei Adam who holds that if one realizes one's error immediately after completing the intermediate blessing, but before beginning ''Be pleased, Lord our G-d'', the first of the final three blessings, one may fulfill one's obligation by simply inserting the words ''VeNa'aseh Lefonechah Korban Musaf'' (And we will perform the additional sacrifice before You). 4) ''Hamakom'' (the place) - one of the alternative names for Hashem. 5) The procedure is as described in note 3. However, one who mistakenly said the Shemoneh Esreh for the additional prayers instead of the Shemoneh Esreh for the morning prayers, has nevertheless fulfilled the obligation for the additional prayers, and after saying the (correct) morning Shemoneh Esreh, does not need to say the Shemoneh Esreh for the additonal prayers again (Mishna Berurah 268:17).

במה דברים אמורים בתפלת ערבית שחרית ומנחה אבל בתפלת מוסף אם התפלל במקומה תפלה אחרת לא יצא הואיל ולא הזכיר קרבן מוסף וכן אם במקום ערבית או שחרית או מנחה התפלל מוסף לא יצא הואיל והזכיר קרבן מוסף ואמר שקר לפני המקום ברוך הוא

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