If one prayed the weekday Amidah on Shabbat (without Shabbat) or did not pray at all, and heard the chazan recite Magen Avot from beginning to end — has he fulfilled his obligation?

Is Vayechulu recited during Maariv of Shabbat, and what is its status if omitted?

2 opinions

If one mistakenly began the weekday Amidah on Shabbat, must he stop immediately or finish the blessing he started?

5 opinions

If one mistakenly says 'Atah' (beginning of a weekday blessing) on Shabbat — must he complete the blessing of 'Atah Chonen'?

5 opinions

If one prayed the full weekday Amidah on Shabbat without any mention of Shabbat, has he fulfilled his obligation?

4 opinions

If one prayed the weekday Amidah on Shabbat without mentioning Shabbat, and then realized — must he repeat from the beginning or only from the Shabbat blessing?

2 opinions

If one mistakenly said one Shabbat Amidah in place of another (e.g., Shacharit instead of Minchah), must he repeat?

4 opinions

Is Vayechulu recited again after the Maariv Amidah, and must it be said standing?

3 opinions

Who recites the Magen Avot (one blessing that encapsulates seven) on Friday night, and may an individual say it?

4 opinions