אורח חיים תמ״חOrach Chayim 448

Se’if 1א׳

חָמֵץ שֶׁל עַכּוּ"ם שֶׁעָבַר עָלָיו הַפֶּסַח, מֻתָּר אֲפִלּוּ בַּאֲכִילָה.

The Law of Chametz Over Which Passover Has Passed. And It Contains Seven Sections: Chametz belonging to a non-Jew over which Passover has passed is permitted even for consumption.

Se’if 2ב׳

אִם עַכּוּ"ם מֵבִיא לְיִשְׂרָאֵל דּוֹרוֹן חָמֵץ בְּיוֹם אַחֲרוֹן שֶׁל פֶּסַח, לֹא יְקַבְּלֶנּוּ הַיִּשְׂרָאֵל, וְגַם לֹא יְהֵא נִכָּר מִתּוֹךְ מַעֲשָׂיו שֶׁחָפֵץ בּוֹ; וְטוֹב שֶׁיֹּאמַר שֶׁאֵינוֹ רוֹצֶה שֶׁיִּקְנֶה לוֹ רְשׁוּתוֹ.

If a non-Jew brings a Jew a gift of chametz on the eighth day of Passover, the Jew should not accept it, and also should not show through his actions that he desires it. And it is good that he should say that he does not want [the chametz] to be acquired for him in his domain.

Se’if 3ג׳

חָמֵץ שֶׁל יִשְׂרָאֵל שֶׁעָבַר עָלָיו הַפֶּסַח, אָסוּר בַּהֲנָאָה אֲפִלּוּ הִנִּיחוֹ שׁוֹגֵג אוֹ אָנוּס. וְאִם מְכָרוֹ אוֹ נְתָנוֹ לְעַכּוּ"ם שֶׁמִּחוּץ לַבַּיִת קֹדֶם הַפֶּסַח, אַף עַל פִּי שֶׁהַיִּשְׂרָאֵל מְכָרוֹ לְעַכּוּ"ם, וְיוֹדֵעַ שֶׁלֹּא יִגַּע בּוֹ כְּלָל אֶלָּא יִשְׁמְרֶנּוּ לוֹ עַד לְאַחַר הַפֶּסַח, וְיַחֲזֹר וְיִתְּנֶנּוּ לוֹ, מֻתָּר, וּבִלְבַד שֶׁיִּתְּנֶנּוּ לוֹ מַתָּנָה גְּמוּרָה בְּלִי שׁוּם תְּנַאי, אוֹ שֶׁיִּמְכְּרֶנּוּ לוֹ מְכִירָה גְּמוּרָה בְּדָבָר מוּעָט; אֲבָל מַתָּנָה עַל מְנַת לְהַחֲזִיר לֹא מְהָנֵי.

Chametz belonging to a Jew over which Passover has passed is forbidden in benefit, even if he left it [in his possession] by mistake or under duress. And if he sold it or gave it to a non-Jew who is outside the house before Passover—even though the Jew acknowledges to the non-Jew and knows that he will not touch it at all, but will guard it for him until after Passover and will then return and give it back to him—it is permitted, provided that he gives it to him as an absolute gift without any condition, or that he sells it to him in an absolute sale for a small amount. But a gift on condition to return it does not work.