אורח חיים תנ״זOrach Chayim 457

Se’if 1א׳

מִפְּנֵי שֶׁצָּרִיךְ לְדַקְדֵּק בְּשִׁעוּר הָעִסָה שֶׁלֹּא לְהַרְבּוֹת בָּהּ מִשּׁוּם חֲשַׁשׁ חִמּוּץ, וּמוּטָב שֶׁיְּמַעֵט בָּהּ, לָכֵן טוֹב לְקָרֵב הָעִסוֹת יַחַד בִּשְׁעַת הַפְרָשַׁת חַלָּה שֶׁיַּשִּׁיקוּ זוֹ בְּזוֹ, דְּשֶׁמָּא יֵשׁ בָּהֶם (אַחַת) שֶׁלֹּא הָיָה בָּהּ כְּשִׁעוּר. וְאִם אִי אֶפְשָׁר לְהַפְרִישׁ חַלָּה בְּעוֹדָהּ עִסָה מִפְּנֵי הַמְּהִירוּת, יַפְרִישֶׁנָּה אַחַר אֲפִיָּה מִיָּד, שֶׁיִּתֵּן כָּל הַמַּצּוֹת בַּסַל וְהַסַל מְצָרְפָם לְחַלָּה; וְזֶהוּ הַדֶּרֶךְ הַיּוֹתֵר נָכוֹן. הַגָּה: וְאִם הָיָה בּוֹ שִׁעוּר חַלָּה וְשָׁכַח לְהַפְרִישׁ, יַפְרִישׁ אַחַר כָּךְ וַאֲפִלּוּ צֵרוּף סַל לֹא צָרִיךְ. וְאִם לָקַח מִמִּקְצָת הָעִסּוֹת, וּמִמִּקְצָת לֹא לָקַח, וְנִתְעָרְבוּ, צָרִיךְ לִקַּח חַלָּה מִכָּל אַחַת וְאַחַת אוֹ יָלוּשׁ עִסָּה אַחֶרֶת וְיִקַּח מִמֶּנּוּ גַּם כֵּן עַל אוֹתָן שֶׁנִּתְעָרְבוּ. וְאִם מַכִּיר מַצָּה אַחַת שֶׁחַיֶּבֶת בְּחַלָּה, נוֹטֵל מִמֶּנָּה עַל הָאֲחֵרוֹת (הַגָּהוֹת מַיְמוֹנִי פ"ג וּמָרְדְּכַי ר"פ אֵלּוּ עוֹבְרִין וּבֵית יוֹסֵף בְּשֵׁם תּוֹסָפוֹת פ"ק דְּבֵיצָה).

THE LAWS ABOUT THE PRACTICE OF SEPARATING CHALLAH TITHES FROM MATZAH DOUGH Because we need to be particular that the proportion of dough is not too large, as there is a concern that the dough may leaven, it is good practice that it [the dough proportion] be lessened somewhat. To that extent, it's good to converge the doughs together at the time of separating Challah tithe to the extent that the doughs kiss[adhere to] each other in a case where they individually don't have the proportions [to be obligated to tithe]. If it's impossible to separate Challah while still in the dough phase because of [leavening] time constraints, it should be separated immediately after baking, when all the Matzot have been placed in a basket. The basket serves to incorporate them together [to meet the proportion for seperating] Challah tithe, and this is the most proper way to do it. Rema: and if there is the proportion for Challah tithe and one forgot to separate, one should separate after that and even incorporating them with a basket is not necessary. If it was taken from some of the doughs and from some of the doughs it was not taken, and they became mixed, it is necessary to separate from every single one [made from that dough] or to knead an alternative dough and take from the alternative on account of the mixture. If it's recognized that one of the Matzot [from the mixture] is obligated in Challah tithe, he should take from it on account of the others. (Haghaot Maimoni perek 3 and Mordechai in the beginning of perek "Ayloo Overeen" and B"Y in the name of Tosafot of the first perek of Beitzah)

Se’if 2ב׳

הַלָּשׁ עִסָה בְּיוֹם טוֹב שֶׁל פֶּסַח, לֹא יִקְרָא שֵׁם לַחַלָּה עַד שֶׁתֵּאָפֶה, שֶׁאִם יִקְרָא לָהּ שֵׁם אֵינוֹ רַשַּׁאי לֶאֱפוֹתָהּ. וְאִם יַנִּיחֶנָּה כָּךְ, תַּחְמִיץ וְאֵינוֹ רַשַּׁאי לְשָׂרְפָהּ בְּיוֹם טוֹב. וְאִם שָׁכַח וְקָרָא לָהּ שֵׁם, יַטִּילֶנָּה לְצוֹנֵן וְיִמְנָעֶנָּה מִלְּהַחְמִיץ. הַגָּה: וְאִם יֵשׁ כֹּהֵן קָטָן שֶׁלֹּא רָאָה קֶרִי, אוֹ גָּדוֹל שֶׁטָּבַל לְקֶרְיוֹ, מֻתָּרִים לֶאֱפוֹת הַחַלָּה בִּשְׁבִילוֹ (טוּר). וְיֵשׁ אוֹמְרִים שֶׁאֵין מַאֲכִילִין חַלָּה בַּזְּמַן הַזֶּה לְשׁוּם כֹּהֵן (מַהֲרִי"ו). יֵשׁ אוֹמְרִים דְּמֻתָּר לוֹ בְּיוֹם טוֹב לָלוּשׁ פָּחוֹת מִכַּשִּׁעוּר, כְּדֵי לִפְטֹר עַצְמוֹ מִן הַחַלָּה (רַ"ן ר"פ אֵלּוּ עוֹבְרִין).

[One who is] kneading dough on Yom Tov of Pesach should not designate for Challah tithe until it is baked. If one designated it [prior to baking], it's unfit to bake and if one retains it, it will leaven and it will be unfit to burn on Yom Tov. If one forgot and designated it [rpior to baking], one should move it to into the cold and it will be restrained from leavening. REMA: and if there is a Cohain child who has not seen yet seen ejaculation or an adult Cohain who has immersed himself [and was purified from] his ejaculation, it is permitted to bake the Challah tithe for him(Tur). There are those who say that we should not feed Challah tithe to any Cohain in present times [Mahriv]. There are those who say that it's permitted to knead less than the proportion in order to exempt himself from the Challah tithe (Ran on the beginning of perek "Ayloo Overeen