Tosefta for Ketubot 4:12
אַתְּ תְּהֵא יָתְבָא בְּבֵיתִי וּמִתְּזָנָא מִנִּכְסַי, כָּל יְמֵי מִגַּד אַלְמְנוּתִיךְ בְּבֵיתִי, חַיָּב, שֶׁהוּא תְנַאי בֵּית דִּין. כָּךְ הָיוּ אַנְשֵׁי יְרוּשָׁלַיִם כּוֹתְבִין. אַנְשֵׁי גָלִיל הָיוּ כוֹתְבִין כְּאַנְשֵׁי יְרוּשָׁלָיִם. אַנְשֵׁי יְהוּדָה הָיוּ כוֹתְבִין, עַד שֶׁיִּרְצוּ הַיּוֹרְשִׁים לִתֵּן לִיךְ כְּתֻבְּתִיךְ. לְפִיכָךְ אִם רָצוּ הַיּוֹרְשִׁין, נוֹתְנִין לָהּ כְּתֻבָּתָהּ וּפוֹטְרִין אוֹתָהּ:
[If he did not write in her <i>ketubah</i>], "You shall live in my house, and be fed out of my property, as long as you remain a widow in my house," he is, [nonetheless], obligated is [nevertheless] in force, as that is a [fixed] stipulation [enacted] by the court. [The above] is what the men of Jerusalem would write [in their <i>ketubot</i>]. The men of the Galilee would write like the men of Jerusalem. [however,] the men of Judea would write "[You shall live in my house, and be fed out of my property] until the heirs want to give you [the amount of] your <i>ketubah</i>." Therefore, if the heirs want, they [may] give her [the amount of] her <i>ketubah</i>, and dismiss her.