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The Ben Ish Hai Parshat Bamidbar Din 2 holds it is permissible (and even recommended in Bagdhad), to bring in the second day of Shavuot early -- to daven and to make kiddush while it is still daytime of the first day. I've never seen anybody actually do this, and I'd like to find out whether this is a psak that's unique to the Ben Ish Hai, or whether it's universally accepted, or whether it's a machloket.

Can anyone share sources that corroborate or refute this Ben Ish Hai?

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Note that this is similar to judaism.stackexchange.com/questions/6999/…, but here I'm asking for sources for something that he just assumes. – Chanoch Apr 24 '14 at 20:43

This question is discussed by R. Henkin in Bnei Banim vol 3 #2. In his teshuva he provides more sources.

The biggest potential pitfall is cooking/preparing food that will only be used on the next halachic day. Consumption of all cooked dishes would need to begin before bein hashmashos according to the Pri Megadim M"Z 503:1 (cited in the Biur Halacha ad loc). If I remember correctly, R. Shlomo Zalman Auerbach in Shulchan Shlomo is more lenient, but this would at most be only until tzeis hakochavim.

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Sounds like he says the Taz 489:10 and Aruch HaShulchan 668:6 both disagree that one can start the second day early. I'll have to look at this in more detail, but this teshuva is a great starting point. – Chanoch May 11 '14 at 3:19

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