ד בְּיוֹם רֹאשׁ חֹדֶשׁ יִכְתֹּב: "בְּיוֹם (רִאשׁוֹן) [אֶחָד] לְיֶרַח פְּלוֹנִי". הַגָּה: וְיֵשׁ אוֹמְרִים דְּכוֹתְבִין בְּאֶחָד לְיֶרַח (מָרְדְּכַי פֶּרֶק הַמְגָרֵשׁ), וּמִכֹּחַ זֶה יֵשׁ נִמְנָעִים לָתֵת גֵּט בְּרֹאשׁ חֹדֶשׁ (כָּךְ כָּתוּב בְּסֵדֶר גִּטִּין). בַּשֵּׁנִי, יִכְתֹּב בִּשְׁנֵי יָמִים, בִּשְׁלשָׁה, בְּאַרְבָּעָה, כֻּלָּם לְשׁוֹן זָכָר בְּהֵ"א לְבַסוֹף. הַגָּה: וְיִכְתֹּב: "יָמִים" עַד עֲשָׂרָה: בִּשְׁנֵי יָמִים, בִּשְׁלשָׁה יָמִים וְכוּ', (בְּסֵדֶר גִּטִּין), וּמִכָּאן וְאֵילָךְ יִכְתֹּב: יוֹם אַחַד עָשָׂר, יוֹם שְׁנֵים עָשָׂר, יוֹם וְכוּ' (מָרְדְּכַי פֶּרֶק הַמְגָרֵשׁ); כָּתַב: יָמִים, לָא מִפְסָל בְּדִיעֲבַד אִם כְּבָר נִתַּן, וְכָל שֶׁכֵּן בִּשְׁעַת הַדְּחָק (בֵּית יוֹסֵף). כָּתַב שְׁלוֹשָׁה אוֹ שְׁמוֹנָה מָלֵא בְּוָי"ו (בְּסֵדֶר ר"י מִינְץ), אוֹ שֶׁלֹּא כָּתַב "בַּשֵּׁנִי" רַק שֵׁנִי (בְּסֵדֶר גִּטִּין), אוֹ שֶׁכָּתַב רָאשֵׁי תֵּבוֹת, כְּגוֹן שֶׁהָיָה לוֹ לִכְתֹּב שְׁנֵים עָשָׂר וְכָתַב י"ב (בְּשֵׁם הָרַב מֶטְרוֹנִי), כָּשֵׁר. וְכֵן בְּאֶחָד וְעֶשְׂרִים, בִּשְׁנַיִם וְעֶשְׂרִים, בִּשְׁלשָׁה וְעֶשְׂרִים, וְכֵן כֻּלָּם:
4 On Rosh Chodesh he shall write, "On the first day of such-and-such month." Rema: There are those who say that we write, "On day one" of the month (Mordechai), and because of this we withhold from giving the bill of divorce on Rosh Chodesh (this is written in Seder Gittin). On the second, he writes, "On two [Shenei] days," "three [Sheloshah]," "four [Arba'ah]," all in the masculine form with a Hei at the end. Rema: He shall write, "days" through ten--"On two days," "On three days," etc. (Seder Gittin)--and from then on he shall write, "day eleven," "day twelve," etc (Mordechai). If he wrote, "days," it is not invalidated post facto if it was already given, and all the more so at a pressing time (Beit Yosef). If he wrote, "three," or, "eight," plene with a Vav (Seder R"I Mintz), or he did not write "On the second," but only "the second" (Seder Gittin), or he wrote acronyms, for example he could not write "twelve" and instead wrote Yud-Bet (Rav Metroni), it is valid. So too [he shall write], "On one and twenty," "On two and twenty," "On three and twenty," and so all of them.