ב אַחַר הַבְּדִיקָה מִיָּד בַּלַּיְלָה יְבַטְּלֶנּוּ וְיֹאמַר: כָּל חֲמִירָא דְּאִיתֵיהּ בִּרְשׁוּתִי דְּלָא חֲזִיתֵיהּ וּדְלָא בִּעַרְתֵּיהּ לִבְטִיל וְלֶהֱוֵי כְּעַפְרָא (דְּאַרְעָא). הַגָּה: וְיֹאמַר הַבִּטּוּל בל' שֶׁמֵּבִין (מַהֲרִ"י ברי"ן). וְאִם אֲמָרוֹ בל' הַקֹּדֶשׁ כָּל חֲמִירָא כּוֹלֵל חָמֵץ וּשְׂאוֹר (ת"ה סִימָן קל"ד), אֲבָל בִּשְׁאָר לְשׁוֹנוֹת צָרִיךְ לְהַזְכִּיר כָּל אֶחָד בִּפְנֵי עַצְמוֹ (דִּבְרֵי עַצְמוֹ), וְטוֹב לַחֲזֹר וּלְבַטְּלוֹ פַּעַם אַחֶרֶת בְּיוֹם י"ד סוֹף שָׁעָה חֲמִישִׁית, קֹדֶם שֶׁתַּגִּיעַ שָׁעָה שִׁשִּׁית, שֶׁמִּשֶּׁתַּגִּיעַ שָׁעָה שִׁשִּׁית נֶאֱסָר וְאֵין בְּיָדוֹ לְבַטְּלוֹ. הַגָּה: וְאֵין לְבַטְּלוֹ בַּיּוֹם אֶלָּא לְאַחַר שֶׁשָּׂרַף הֶחָמֵץ, כְּדֵי לְקַיֵּם מִצְוַת שְׂרֵפָה בֶּחָמֵץ שֶׁלּוֹ (מַהֲרִי"ו).
2 After the examination, immediately at nightfall, we will nullify it and say: Any leaven that is in my possession, which I have not seen and have not removed, shall be nullified and become like the dust of the earth. Rema: And one should declare the nullification in a language that is understood [as stated by Maharil, son of Rabbeinu Nosson], and if one said it in Hebrew: 'Any leaven includes both leaven and sourdough' [Tur, Orach Chayim, Chapter 434]. However, in other languages, one must mention each one separately [Darchei Moshe]. And it is good to go back and nullify it again another time on the fourteenth day, at the end of the fifth hour, before the sixth hour arrives, as once the sixth hour arrives, it becomes forbidden, and there is no opportunity to nullify it. Rema: And one should not nullify it during the day, but rather after burning the leaven, in order to fulfill the commandment of burning one’s leaven. (Mahariv)