Template:Fasting on Erev Rosh Hashana
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Who Should Fast
- There is a custom to fast on Erev Rosh HaShanah.
- Where there is a Brit Milah that day, one may eat. Some are of the opinion that one can exempt himself with a Siyum Masechet or any other Seudat Mitzvah, as well.
- Some say that the minhag is that women do not fast on Erev Rosh Hashana. 
Accepting the Fast
When Does the Fast End
- Some say one should be sure to complete the fast. Most Ashkenazim say that one should not fast until Tzeit HaKochavim, as that would cause him to enter Yom Tov famished. Instead, one should fast until either Mincha Gedolah or Plag HaMincha, daven mincha and eat afterwards. Others suggest that one should only fast until Chatzot, eat and then daven mincha afterwards.
Aneinu and Keriat HaTorah at Mincha
- One who is still fasting at mincha, should recite aneinu during mincha,  For the chazzan, if he doesn't plan on finishing the fast, he shouldn't recite aneinu in the chazarat hashatz at all. 
- Regardless of how long one plans to fast for, one should not lain the traditional laining for a Ta'anit Tzibur ("Vayechal Moshe").
- Shulchan Aruch Orach Chaim 582:2 based on a Midrash Tanchuma
- Rama, Orach Chaim 581:2
- Orchot Rabbeinu Vol. 2, pg 172 in the name of the Steipler Gaon. Elef HaMagen S"K 77.
- Magen Avot (Lebhar, Orach Chaim 581:2
- Mishna Brurah 581:16 writes that women also fast, but Rabbi Yissachar Dov Krakowski says this isn't the custom.
- Mishna Brurah 581:16, Rabbi Yissachar Dov Krakowski. This is also the ruling of Rabbi Eli Mansour However, Revach.net quotes Rav Elyashiv as saying that if you don't fast every year, you should accept it during mincha the day before.
- Rabbi Eli Mansour says that one shouldn't eat until Kiddush that night. see Yalkut Yosef Moadim pg. 20 and Halichot Olam 2:pg. 233
- Rama Orach Chaim 581:2 writes that one doesn't need to complete the fast of Aseret Yemey Teshuva. Magen Avraham 581:10 and Mishna Brurah 581:16 apply this to Erev Rosh Hashana as well. Mateh Efraim Siman 38
- MaChazit HaShekel Orach Chaim 581 S"K 10. Mishna Berurah 562 S"K 10 says one can rely on this opinion in the event one cannot fast until Plag Mincha. This is the widespread practice.
- Mateh Efraim, Siman 35. Mishna Berurah 562:10. In either case, one should not formally declare the fast at Mincha of the day before, as doing so without stipulating that he will not complete the fast will require him to do Hatarat Nedarim to finish it before Yom Tov begins.
- Shu"t Yaavet"z 2:147, Elef HaMagen S"K 73, Likutei MaHariach- Dinei U'Minhagei Aseret Yimei Teshuva.
- Mishna Brurah 562:7 says this is true even if you do not plan on finishing the fast. For sephardim, the Kaf Hachayim 562:8 says if you do not plan on finishing the fast to recite aneinu during elokay nitzor.
- Beiur Halachah 562:1 "aval."
- Rama, Orach Chaim 581:2