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If someone uses a kiddush cup that is exactly (or close to) the bare minimum (see this question) needed to fulfill the obligation, how much of that cup must he drink?

Do the different times one must drink a cup of wine have different requirements? If so, what are those requirements? Some of the times I can think of (add more if you can think of them):

  • Kiddush Friday (or Yom Tov) Night
  • Kiddush Shabbat (or Yom Tov) Day
  • Havdalah
  • When Bentching with Wine
  • Under the Chupah at a Wedding
  • At a circumcision.
  • Bride and Groom at Sheva Brachot
  • Chol HaMoed
  • 4 cups of wine at Seder, Pesach night
  • when drinking a cup of wine for no reason

Or is the obligation the same no matter when you're blessing and drinking a cup of wine?

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Chol HaMoed? Do you mean kiddush on shabbat chol hamoed or for the mitzva of simcha be'yayin during chol hamoed? –  Double AA Dec 6 '11 at 22:31
    
@DoubleAA: simcha be'yayin durin chol hamoed. I assume there would be no difference between a regular shabbat and shabbat chol hamoed. –  Menachem Dec 6 '11 at 22:46

1 Answer 1

See here.

In summary, the answers vary from tasting (a small sip), a cheekful (varies per person and is usually assumed to be the majority of the reviit), a reviit (86.4 mL).

  • Kiddush Friday (or Yom Tov) Night -- ideally a cheekful, ex post facto even a reviit.
  • Kiddush Shabbat (or Yom Tov) Day -- ideally a cheekful, ex post facto even a reviit.
  • Havdalah -- ideally a reviit, ex post facto a cheekful.
  • When Bentching with Wine -- ideally a reviit (Shulchan Aruch 190:3), ex post facto a cheekful.
  • Under the Chupah at a Wedding -- tasting.
  • At a circumcision -- tasting.
  • Bride and Groom at Sheva Brachot -- tasting.
  • Chol HaMoed -- for simchat yom tov -- a reviit.
  • 4 cups of wine at Seder, Pesach night -- ideally the full cup, next ideal is majority of the cup, ex post facto a cheekful.
  • when drinking a cup of wine for no reason -- either tasting or a reviit, ex post facto a cheekful.

When I say 'ex post facto' I mean that by doing so you have fulfilled the relevant obligation but may be stuck with other (usually bracha achrona) problems.

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Re "ideally a cheekful, ex post facto even a reviit": I didn't check your source document, but for most people (and IIRC according to some authorities for everyone) a cheekful is less than a r'viis. –  msh210 Dec 6 '11 at 23:15
    
@msh210 It's not a typo. A cheekful is indeed assumed to be less than a reviit and for kiddush a reviit is the bedieved option. –  Double AA Dec 7 '11 at 5:29
    
with regards to a Birchat Hamazon, please see Mishna Berura 309:14, who quotes the opinion that ex post facto a cheekful is enough (the Taz), but then mentions that all the Acharonim dismiss this: hebrewbooks.org/pdfpager.aspx?req=14164&pgnum=174 –  Menachem Dec 18 '11 at 2:40
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where is your source for "Bride and Groom at Sheva Brachot -- ideally a reviit, ex post facto a cheekful." the document you're quoting from mentions that the one leading the grace after meals must do so. It doesn't mention anything about the bride and bridegroom. Wouldn't that be just a taste? –  Menachem Dec 18 '11 at 2:48
    
@Menachem Et Chata'ay Ani Mazkir HaYom! Good catch -- that was my bad. Also, I think you meant 190:14 not 309. I don't see why you point me there though; he ends up agreeing with me. –  Double AA Dec 18 '11 at 3:49

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