The main mitzvah of Havdala is to say it on Saturday night. (Source.)

In a particular week, you have a lot of schoolwork you want to get done. You decide to do a water fast for a few days, to save time. You'll consume only water, not food.

There is nobody around to make Havdalah, or at least to drink the wine instead of you. (Related article: "Saying Havdala and having someone else drink". It's written by the Lubavitcher who runs Shulchanaruchharav.com.)

A.) Are you allowed to do a water fast from Saturday night until Tuesday morning, and then recite partial Havdalah on Tuesday morning?

B.) Is this fine to do, despite the fact that Havdalah will be delayed? Or do the authorities advise against doing so?

Related questions

  • 2
    Why not just start your fast 10 minutes later after havdala? This case feels ridiculous
    – Double AA
    Aug 29, 2023 at 15:33
  • @DoubleAA: It may sound ridiculous, but it's based on an actual case which happened to me. ❧ Assume that you didn't eat any meal on Shabbos afternoon. Drinking wine or grape juice on an empty stomach, and not consuming any food with it, may cause an unhealthy blood sugar spike. It's perhaps not the wisest idea. Aug 29, 2023 at 15:55
  • 2
    You are required to eat a bread meal every shabbat afternoon
    – Double AA
    Aug 29, 2023 at 16:28
  • 2
    Are you talking about a case where there is no one else around to make Havdalah or at least drink the wine instead you?
    – שלום
    Aug 30, 2023 at 22:37
  • 1
    Your case is getting very convoluted and far-fetched. If you're willing to water-fast for only 2½ days (Saturday night untill Tuesday morning), why not take the time to prepare and eat on Saturday night and mavdil on wine then, then fast until later in Tuesday, to make up the 2½ days? Why not accept the 30-60 minute loss on these one-off situations (and plan better to avoid them in future)? As Double AA said, "this case feels ridiculous".
    – Tamir Evan
    Apr 19 at 15:43


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