Mi Yodeya is a question and answer site for those who base their lives on Jewish law and tradition and anyone interested in learning more. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

The Shulhan 'Aruch (OC 489:10) states:

אסור לאכול חדש אף בזמן הזה בין לחם בין קלי בין כרמל עד תחלת ליל יח בניסן ובארץ ישראל עד תחלת ליל יז בניסן

"It is forbidden to eat new (grains) even today ... until the start of the night of 18 Nisan, and in the Land of Israel until the start of the night of 17 Nisan."

Why the difference, and what is the source?

share|improve this question
Its a gemara in menachot because of safek deyoma. Please cite your as noted elsewhere. I recall us noting otherwise. – Double AA Apr 25 '13 at 12:54
@DoubleAA, touche. I'll edit. I made a leap from thinking in my head, "as noted elsewhere we don't keep two days of Yom Kippur and don't count two days of the 'Omer each night," to actually writing, "as noted elsewhere, this rule is really limited to just that, with no real peripheral effects." – Seth J Apr 25 '13 at 13:00
Excellent question, and yes generally the two-day thing is limited to observing laws of holidays. I was wondering about this too. Chayei Adam records that the Vilna Gaon would eat matza made of new grain on the first day it was permissible to do so, i.e. the 18th of Nissan. – Shalom Apr 25 '13 at 13:07
@michoel, thanks for the editing help! – Seth J Apr 25 '13 at 13:17

(Background: Biblically, the new grain becomes permitted at dawn on the 16th of Nissan if there is no Korban Omer being brought, but Rabbi Yochanon ben Zakai enacted to wait the whole day now that there is no Temple.)

The Talmud (Menachot 68b) records:

רב פפא ורב הונא בריה דרב יהושע אכלי חדש באורתא דשיתסר נגהי שבסר קסברי חדש בחוצה לארץ דרבנן ולספיקא לא חיישינן ורבנן דבי רב אשי אכלו בצפרא דשבסר קסברי חדש בחוצה לארץ דאורייתא ורבן יוחנן בן זכאי מדרבנן קאמר וכי תקין ליום הנף לספיקא לא תקין אמר רבינא אמרה לי אם אבוך לא הוה אכיל חדש אלא באורתא דשבסר נגהי תמניסר דסבר לה כר' יהודה וחייש לספיקא

R. Papa and R. Huna the son of R. Joshua used to eat the new corn on the night of the sixteenth day which is really the beginning of the seventeenth day, for they hold the view that the prohibition of the new corn outside the land [of Israel] is only Rabbinical and that the doubt need not be taken into account. The Rabbis of the school of R. Ashi used to eat it on the morning of the seventeenth, for they hold that the prohibition of the new corn outside the land of Israel is Biblical, but that the ruling of R. Johanan b. Zakkai was only a Rabbinic ordinance; and this ordinance, they maintain, was intended to apply only to the actual day of the waving but not to the day of doubt. Rabina said, ‘My mother told me that your father did not eat of the new corn until the night of the seventeenth which is the beginning of the eighteenth, for he is of the same opinion as R. Judah and also takes into account the day of doubt’. (Translation from Soncino)

The Rambam (M"A 10:2), Rif (28a) and Rosh (42) all rule like Ravina (that the new grain in the Diaspora is biblically forbidden and RYBZ's enactment applies to the second doubtful day as well) who is recorded last, and so rules the Shulchan Aruch.

share|improve this answer
In general it seems to me now that we are machmir for sefeika deyoma on all deoraita things (shofar and seder for two days, chodosh, sukkah on shmini atzeret, issur chametz) but not for derabanan things (counting omer, lulav, three weeks, purim, chanukah). – Double AA Apr 25 '13 at 15:24

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.