Commentary for Gittin 9:3
גּוּפוֹ שֶׁל גֵּט, הֲרֵי אַתְּ מֻתֶּרֶת לְכָל אָדָם. רַבִּי יְהוּדָה אוֹמֵר, וְדֵין דְּיֶהֱוֵי לִיכִי מִנַּאי סֵפֶר תֵּרוּכִין וְאִגֶּרֶת שִׁבּוּקִין וְגֵט פִּטּוּרִין, לִמְהָךְ לְהִתְנְסָבָא לְכָל גְּבַר דְּתִצְבַּיִן. גּוּפוֹ שֶׁל גֵּט שִׁחְרוּר, הֲרֵי אַתְּ בַּת חוֹרִין, הֲרֵי אַתְּ לְעַצְמֵךְ:
The basic text of the get: "You are permitted to all men." R. Yehudah says: "And this shall be to you from me a writ of divorce, a letter of leaving, a get of dismissal (wherewith) to go and marry any man you desire." [For it must be manifest that he divorces her with this writ; and if he does not write it thus, they might come to say that he divorced her by speech alone, of which the writ is only confirmation. The halachah is in accordance with R. Yehudah.] The basic text of a writ of manumission: "You are free." "You belong to yourself."
Bartenura on Mishnah Gittin
English Explanation of Mishnah Gittin
The body of a writ of emancipation is: “Behold you are a free woman”, “Behold you belong to yourself.”
This mishnah provides the wording for the standard parts of divorce documents and documents which free slaves.
The mishnah is straightforward and doesn’t require any explanation. One thing to note is that Rabbi Judah’s addition to the get is in Aramaic. Documents in this period were in Aramaic (or Greek), the lingua franca(s) of Palestine during the mishnaic and talmudic periods. Rabbi Judah may have insisted that the get be in Aramaic so that everyone would understand it.