Updated: Nov 22, 2021
The Daily Halacha Moment - Mistakes in Shabbat Shemoneh Esrei 📖
״כל השונה הלכות בכל יום - מובטח לו שהוא בן העולם הבא״ (נידה עג ע״א, מגילה כח:)
“Anyone who studies Halachot every day is guaranteed that he is destined for the world-to-come” (Megilla 28b, Niddah 73a)
I made a mistake in the Shemoneh Esrei of Shabbat, what do I do?
In order to avoid confusion, one should be especially careful to pray from a siddur on Shabbat, and not rely on one’s memory when praying, since the Shabbat teffilot can easily be mixed up with weekday or other Shabbat teffilot if one is not fully concentrating. 
One who accidentally started to recite “Atah Chonen” after the berachah of HaE-l HaKadosh, should finish the berachah and then continue with the Shabbat Amidah. This is the case for Shacharit and Minchah as well. Similarly, if one only remembers that it is Shabbat, and one is in the middle of the Amidah, then one should finish the berachah that he is reciting and then continue with the Shabbat Amidah. 
If one remembers to recite the Shabbat Amidah only after he recited “Atah” and did not yet say “chonen,” then it depends; if when one said the word “Atah” one knew it was Shabbat but was about to accidentally say “chonen” then one may continue with the Shabbat Amidah. However, if one did not remember that it was Shabbat at all when he said the word “Atah” then one must finish the berachah of Atah Chonen and then one may continue with the Shabbat Amidah. 
One who accidentally recited an entire weekday Shemoneh Esrei, instead of any of the Shabbat teffilot, must return and recite the Amidah again for Shabbat.  Similarly, one who is unsure if he recited a Shabbat Amidah or a weekday Shemoneh Esrei, does not have to pray again.  However, according to the Mishnah Berurah (268:9) one would need to repeat the Shabbat Shemoneh Esrei.
. Yalkut Yosef, Shabbat, book 1, vol. 2, p. 559. See also in Tzitz Eliezer 13:25.
. Shulchan Aruch 268:2; Chazon Ovadia, Shabbat, vol. 1, p. 346.
. Shulchan Aruch 268:3; Chazon Ovadia, Shabbat, vol. 1, pp. 346-347. One does not have to complete the berachah of Atah Chonen even when one said “Atah” during Shacharit, instead of beginning “Yismach Moshe.” The reason for this is that even though Shacharit of Shabbat does not have “Atah” in it, nevertheless, since technically, one also fulfills his obligation of praying if one mixed up the teffilot of
Shabbat, such as mixing up Shacharit with Arvit, by reciting “Atah” it is not as if one has begun a weekday prayer. See also in Yalkut Yosef, Shabbat, book 1, vol. 2, p. 563
. Shulchan Aruch 268:5; Chazon Ovadia, Shabbat, vol. 1, p. 352.
. Chazon Ovadia, Shabbat, vol. 1, p. 353; Yabia Omer 7:28. Unlike the opinion of the Mishnah Berurah 268:9 who states that one should repeat the Amidah again. See also in Tzitz Eliezer 13:25.
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