אבן העזר קכ״גEven HaEzer 123

Se’if 1א׳

הַכֹּל כְּשֵׁרִים לִכְתֹּב הַגֵּט, חוּץ מֵחֲמִשָּׁה: גּוֹי וְעֶבֶד וְחֵרֵשׁ שׁוֹטֶה וְקָטָן. אֲפִלּוּ הָאִשָּׁה בְּעַצְמָהּ, אִם אָמַר לָהּ הַבַּעַל לְכָתְבוֹ, יְכוֹלָה לְכָתְבוֹ וְתַקְנֶה אוֹתוֹ לַבַּעֲלָהּ וְחוֹזֵר וְנוֹתְנוֹ לָהּ. הַגָּה: וְהַבַּעַל לְכַתְּחִלָּה לֹא יִכְתֹּב הַגֵּט בְּעַצְמוֹ, גַּם לֹא יְצַוֶּה לַסוֹפֵר כֵּיצַד יִכְתֹּב, אֶלָּא אוֹמֵר לוֹ, סְתָם, לִכְתֹּב (מָצָא בַּקוּנְטְרֵסִים). וְיֵשׁ אוֹמְרִים דְּיֵשׁ לְהַחֲמִיר שֶׁגַּם קָרוֹב לֹא יִכְתֹּב לְכַתְּחִלָּה, הֵיכָא דְּאֶפְשָׁר בְּאַחֵר (מַהֲרִי"ק שֹׁרֶשׁ ק"ו). וּלְכַתְּחִלָּה יִכְתֹּב הַסוֹפֵר בְּיָדוֹ הַיְמָנִית; וְאִם הוּא אִטֵּר יָד, יִכְתֹּב בִּשְׂמֹאלוֹ (מ"כ בְּתִקוּן יָשָׁן):

Anyone is kosher as a scribe for a divorce document, except for five people: A non-Jew, a slave, a deaf-and-dumb person [who is presumed to be unable to have proper intent], an insane person, and a child. Even the woman herself, if her husband would ask her to write it, can write it and cause her husband to acquire it, and he would go and give it to her. Rama: And the husband ideally should not write the divorce document himself, and he should also not command the scribe on how it should be written, but he should rather say, plainly, to write (found in Kuntresim). Some say that there is what to be stringent that ideally a relative should also not write it, when another person is available (Makarik Shoresh 106). Ideally the scribe should write with his right hand. If he is left handed, he should write with his left (M"C B'Tikun Yashan).

Se’if 2ב׳

יִשְׂרָאֵל שֶׁהֵמִיר, אוֹ שֶׁהוּא מְחַלֵּל שַׁבָּתוֹת בְּפַרְהֶסְיָא, הֲרֵי הוּא כְּגוֹי לְכָל דָבָר:

A Jew that apostatizes, or violates Sabbaths in public, he is considered a gentile in all aspects.

Se’if 3ג׳

כָּתַב הַגֵּט אֶחָד מֵאֵלּוּ הַחֲמִשָּׁה, אֵינוֹ גֵּט אַף עַל פִּי שֶׁחָתְמוּ בּוֹ עֵדִים כְּשֵׁרִים וְנִמְסַר לָהּ בִּכְשֵׁרִים. בַּמֶּה דְבָרִים אֲמוּרִים, בְּשֶׁכָּתַב הַתֹּרֶף; אֲבָל אִם לֹא כָּתַב אֶלָּא הַטֹּפֶס, וְהִנִּיחַ מְקוֹם הַתֹּרֶף שֶׁהוּא מְקוֹם הָאִישׁ וְהָאִשָּׁה וְהַזְּמַן וַ"הֲרֵי אַתְּ מֻתֶּרֶת לְכָל אָדָם", וּכְתָבוֹ הַפִּקֵּחַ הַגָּדוֹל הַיִּשְׂרְאֵלִי לִשְׁמוֹ, הֲרֵי זֶה גֵּט כָּשֵׁר. וְיֵשׁ אוֹמְרִים דַּאֲפִלּוּ בְּכִי הַאי גַּוְנָא פָּסוּל מִדְּרַבָּנָן (טוּר בְּשֵׁם ר"י):

A divorce document written by one of these five people is not a divorce document, even though it is signed by kosher witnesses and by kosher [witnesses] it is given over to her. When does this apply? When the specific details are written in (toref). But if only the form text (tofes) is written, and a space is left for the toref, i.e. the place for the [name of] the man, woman, date, and [the line] "Behold you are permitted to anyone else," and an adult Jew of sound mind writes [those] with proper [intent], that is a kosher divorce document. Rama: Some say that even in this way is invalid on a rabbinical level (Tur in the name of R"Y).