סימן קעב סעיף ב

לְדַעַת רֹב גְּדוֹלֵי הַפּוֹסְקִים, אִסּוּר זֶה גַּם בְּחוּץ לָאָרֶץ הוּא מִן הַתּוֹרָה. וְלָכֵן צְרִיכִין לְהַשְׁגִּיחַ מְאֹד בִּתְבוּאָה שֶׁנִזְּרְעָה לִפְעָמִים אַחַר הַפֶּסַח אוֹ סָמוּךְ לִפְנֵי הַפֶּסַח, שֶלֹּא הִשְׁרִישָׁה קֹדֶם שִׁשָׁה עָשָֹר בְּנִיסָן, כְּגוֹן שְׂעוֹרִים וְשִׁבֹּלֶת שׁוּעָל, וּבִקְצָת מְקוֹמוֹת גַּם חִטִּין, שֶׁהֵן אֲסוּרוֹת עַד לְאַחַר שִׁבְעָה עָשָׂר בְּנִיסָן הַבָּא. (וְאִם הִשְׁרִישָׁה בְּיוֹם שִׁשָׁה עָשָׂר, מֻתֶּרֶת בִּתְחִלַּת לֵיל שִׁבְעָה עָשָׂר בְּנִיסָן הַבָּא, מִכֹּחַ מִמַּה נַפְשָׁךְ). וְגַם הַשֵּׁכָר שֶׁנַּעֲשָׂה מִתְּבוּאָה זוֹ, אָסוּר עַד לְאַחַר הַפֶּסַח הַבָּא. וְכֵן הַשְּׁמָרִים, אֲסוּרִים. וְאִם חִמְּצוּ בָהֶם עִסָּה, אֲפִלּוּ מִתְּבוּאָה יְשָׁנָה, כָּל הָעִסָּה אֲסוּרָה מֵחֲמַת הַשְּׁמָרִים. תְּבוּאָה שֶׁמִּסְתַּפְּקִים בָּהּ אִם הִיא יְשְׁנָה אוֹ חֲדָשָׁה, יַעֲשׂוּ עָלֶיהָ שְׁאֵלַת חָכָם.

According to most of the greatest Poskim,³Rif, Rambam, Smag, Rosh, Ittur, Mordecai—Ravia, Hagahos Maimonee, Ritvah, Shulchan Aruch, etc. However, the Ohr Zarua is inclined, when there is a doubt about a particular product from outside Eretz Yisrael, to consider it a Rabbinical injunction and is lenient. The Trumas Hadeshen says grain of a non-Jew’s fields outside Eretz Yisroel is “chodosh” only as a Rabbinical injunction and Bach-Riva permit it entirely. Anyone who can, should be strict with regard to “chodosh” outside Eretz Yisroel, as most poskim hold it is de’oraisa, and certainly if you know it is “chodosh,” you should not eat it, since, even most of those who say it is not a de’oraisa, say it is a Rabbinical injunction (Biur Halacha 489:10) the above prohibition, even outside Eretz Yisroel, is a Scriptural prohibition. Therefore we must pay careful attention to grain crops that are sometimes sown after Pesach or so close to Pesach that it has not taken root before the sixteenth of Nissan, such as barley and oats, and in some places also wheat, for they are forbidden until after the seventeenth of Nissan of the next year. (If it had taken root on the sixteenth day of Nissan, it is permitted at the beginning of the seventeenth night of Nissan of the next year in any event.) Also the beer⁴Some Poskim are lenient with regard to beer and all malt products. made from this grain, is forbidden until after the next Pesach. Also the lees are forbidden. If dough was leavened with it, even if the dough was made from the old grain crops, the entire dough is forbidden due to the yeast. Concerning crops about which there is a doubt whether it is old or new, you should consult a Poseik.

תנא דבי אליהו כל השונה הלכות בכל יום מובטח לו שהוא בן העולם הבא שנאמר הליכות עולם לו אל תקרי הליכות אלא הלכות (נדה ע"ג.)