My Rabbi said that it is a halachah to interrupt (most places) in prayer to say aleinu together with a minyon. What is the source for this?
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2there is no halokho to so oleinu at all except for rosh hashono– MoriDowidhYa3aqovCommented Mar 30, 2015 at 2:51
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@MoriDoweedhYaa3qob And Yom Kippur in a Yovel.– Double AA ♦Commented Mar 30, 2015 at 3:39
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Closely related: judaism.stackexchange.com/q/22674– msh210 ♦Commented Mar 30, 2015 at 17:04
1 Answer
I assume he means places where one is allowed to interrupt anyway (i.e., not in the middle of a bracha, pesukei dzimra, birchat shma, shemoneh esrei, etc.) in which case his source is presumably e.g. the Mishna Brurah 65:9 or Yalkut Yosef (Tefillah vol 2, p. 462) where they rule that when the congregation is saying "Aleinu...", one should also say it along with them (see also: http://halachipedia.com/index.php?title=Tachanun,_Ashrei,_Aleinu,_Shir_Shel_Yom ).