We know that when there is a case of someone that is obligated to perform a mitzvah m'drabbanan (and in fact there are 2 d'rabbanans together) they can't be "motzei" someone in the mitzvah who only ...
The Aruch HaShulchan has an opinion on whether one person can motzi (exempt) a crowd with a bracha acharona (after-bracha) on mezonot foods. It is along the lines of it is better not to have one ...
I understand that if I hear another person make a bracha (and perhaps even if I don't actually hear it), I may? must? respond "amen". I also understand that saying "amen" can allow me to be yotzei ...
The gemorah in Sukkah daf 51b explains that, in the enormous shul in Alexandria, in order for everyone to know when to answer Amen when the shliach tzibbur (prayer leader, aka sha"tz) was davening, ...
Suppose the one who is leining (reading) the Megillah needs to stop in the middle of leining, and is unable to continue. Is someone who was there the entire time allowed to take over?
Some people, although listening to another's kidush (Friday night), sing part of it along with him: specifically (in my experience), the lines starting "ki vanu vacharta" when recited with this tune. ...
It says in the Baal HaTanya's Hilchos Talmud Torah that one fulfills his obligation to learn Torah only if he says the words. Moreover, a Chavrusa fulfills his obligation only because Shomeya Keoneh. ...
When making Kiddush, does everyone who is yotzei have to drink the wine or grape juice, or is merely hearing it enough? In my experience, it appears that Friday nights everyone is careful to drink, ...
The responsibility of reading Zachor is in order to remember to wipe out Amalek. Therefore we read it annually. Does someone who hears the words of Zachor, but does not understand them, still ...