סימן קא סעיף ד
אִם הֱבִיאָם הַנָּכְרִי בִּשְׁבִיל יִשְֹרָאֵל לְדוֹרוֹן אוֹ לְמָכְרָם לוֹ, יֵשׁ לֶאֱסוֹר גַּם בְּיוֹם טוֹב שֵׁנִי. וְאַךְ אִם חָל יוֹם טוֹב בַּיוֹם הַחֲמִשִּׁי וּבַיוֹם הַשִׁשִּׁי וְהֵבִיא בַּיוֹם הַחֲמִשִּׁי, אִם יֵשׁ צֹרֶךְ גָּדוֹל, מֻתָּר לְטַלְטְלָן בַּיוֹם הַשִׁשִּׁי וּלְבַשְּׁלָם לִכְבוֹד שַׁבָּת. וּבְיוֹם טוֹב שֶׁל רֹאשׁ הַשָּׁנָה, גַּם זֶה אָסוּר (תקט"ו).
If the non-Jew brings these things, as a gift for a Jew or to sell them to him, they are forbidden even on the second day of Yom Tov.10Ramah 515:1, Rabheinu Tam. However, it is permitted for guests who were unexpected when the non-Jew brought it, or for out-of-town guests. In such a case, you may also eat from it with them in their honor. (Magein Avraham, Mishnah Berurah 515:12) 11This is only in cases where a melachah is involved, but where the techum is concerned, the poskim are lenient, as is the Shulchan Aruch. (Ramah 515:5, Mishnah Berurah) The Misgeros Hashulchan says the grouping together of techum and melachah in paragraphs 3 and 4 may be a typographical error in the Kitzur Shulchan Aruch, for it is explicit in the Talmud and poskim that they are not the same. See footnote 9. If Yom Tov occurs on Thursday and Friday, and the non-Jew brings them on Thursday, if it is very urgent,12Mishnah Berurah 515:42 says if you need it in honor of Shabbos, and you have no other food of this type in your house, it is also permitted. you are permitted to handle them13If you do have more of this type of food in your house, you may still have it cooked for Shabbos by a non-Jew, but you should not handle it. (Magein Avraham, Eliyahu Rabbah, Mishnah Berurah) on Friday, and cook them in honor of Shabbos.14You must wait on Friday night, however, until after “due time” elapses. (Beis Yosef, Mishnah Berurah 515:40) On the Yom Tov of Rosh Hashanah, even this, is forbidden.
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.)