Halakhah for Challah 2:7
שִׁעוּר הַחַלָּה, אֶחָד מֵעֶשְׂרִים וְאַרְבָּעָה. הָעוֹשֶׂה עִסָּה לְעַצְמוֹ, וְהָעוֹשֶׂה לְמִשְׁתֵּה בְנוֹ, אֶחָד מֵעֶשְׂרִים וְאַרְבָּעָה. נַחְתּוֹם שֶׁהוּא עוֹשֶׂה לִמְכֹּר בַּשּׁוּק, וְכֵן הָאִשָּׁה שֶׁהִיא עוֹשָׂה לִמְכֹּר בַּשּׁוּק, אֶחָד מֵאַרְבָּעִים וּשְׁמֹנָה. נִטְמֵאת עִסָּתָהּ שׁוֹגֶגֶת אוֹ אֲנוּסָה, אֶחָד מֵאַרְבָּעִים וּשְׁמֹנָה. נִטְמֵאת מְזִידָה, אֶחָד מֵעֶשְׂרִים וְאַרְבָּעָה, כְּדֵי שֶׁלֹּא יְהֵא חוֹטֵא נִשְׂכָּר:
The minimum measure of <i>Challah</i> is one twenty-fourth [of the dough]. If one makes dough for oneself, or if one makes a dough for his son's banquet, [then the minimum measure is] one twenty-fourth. If a baker makes [dough] to sell in the market, and if a woman makes [dough] to sell in the market, [the minimum measure is] one-forty eighth. If her dough became impure mistakenly, or accidentally, [the minimum measure] is one forty-eighth. If it was defiled on purpose, it is one twenty-fourth, so that the sinner does not profit [from his sin].