הַמְגָרֵשׁ עַל תְּנַאי אִם נִתְקַיֵּם הַתְּנַאי הֲרֵי זוֹ מְגֹרֶשֶׁת וְאִם לֹא נִתְקַיֵּם הַתְּנַאי אֵינָהּ מְגֹרֶשֶׁת. וּכְבָר בֵּאַרְנוּ בְּפֶרֶק שִׁשִּׁי מֵהִלְכוֹת אִישׁוּת מִשְׁפְּטֵי הַתְּנָאִין כֻּלָּם. וְשָׁם נִתְבָּאֵר שֶׁהַמְגָרֵשׁ עַל תְּנַאי כְּשֶׁיִּתְקַיֵּם הַתְּנַאי תִּהְיֶה מְגֹרֶשֶׁת בְּשָׁעָה שֶׁיִּתְקַיֵּם. לֹא בִּשְׁעַת נְתִינַת הַגֵּט לְיָדָהּ. לְפִיכָךְ יֵשׁ לַבַּעַל לְבַטֵּל הַגֵּט אוֹ לְהוֹסִיף עַל תְּנָאוֹ אוֹ לְהַתְנוֹת עַל תְּנַאי אַחֵר כָּל זְמַן שֶׁלֹּא נִתְקַיֵּם הַתְּנַאי הָרִאשׁוֹן אַף עַל פִּי שֶׁהִגִּיעַ גֵּט לְיָדָהּ. וְאִם מֵת הַבַּעַל אוֹ אָבַד הַגֵּט אוֹ נִשְׂרַף קֹדֶם שֶׁיִּתְקַיֵּם הַתְּנַאי אֵינָהּ מְגֹרֶשֶׁת. וּלְכַתְּחִלָּה לֹא תִּנָּשֵׂא עַד שֶׁיִּתְקַיֵּם הַתְּנַאי. וְאִם נִשֵּׂאת לֹא תֵּצֵא אֶלָּא אִם כֵּן לֹא נִשְׁאַר בְּיָדָהּ לְקַיְּמוֹ. שֶׁהֲרֵי בָּטַל הַתְּנַאי. וְשָׁם נִתְבָּאֵר שֶׁאִם אָמַר לָהּ הֲרֵי אַתְּ מְגֹרֶשֶׁת מֵעַכְשָׁו אוֹ מֵהַיּוֹם עַל תְּנַאי כָּךְ וְכָךְ. אוֹ שֶׁאָמַר לָהּ הֲרֵי אַתְּ מְגֹרֶשֶׁת עַל מְנָת כָּךְ וְכָךְ. כְּשֶׁיִּתְקַיֵּם הַתְּנַאי תִּהְיֶה מְגֹרֶשֶׁת מִשְּׁעַת נְתִינַת הַגֵּט לְיָדָהּ. לְפִיכָךְ אֵינוֹ יָכוֹל לְבַטֵּל הַגֵּט וְלֹא לְהוֹסִיף עַל תְּנָאוֹ מִשֶּׁהִגִּיעַ גֵּט לְיָדָהּ. וְאִם אָבַד אוֹ נִשְׂרַף אֲפִלּוּ מֵת הַבַּעַל קדֶם שֶׁיִּתְקַיֵּם הַתְּנַאי הֲרֵי זוֹ מְקַיֶּמֶת הַתְּנַאי אַחַר מוֹתוֹ וּכְבָר נִתְגָּרְשָׁה מִשְּׁעַת נְתִינַת הַגֵּט לְיָדָהּ וְיֵשׁ לָהּ לְהִנָּשֵׂא לְכַתְּחִלָּה אַף עַל פִּי שֶׁעֲדַיִן לֹא נִתְקַיֵּם הַתְּנַאי. וְאֵין חוֹשְׁשִׁין שֶׁמָּא לֹא יִתְקַיֵּם הוֹאִיל וְהָיָה הַתְּנַאי בִּמְעַכְשָׁו אוֹ בְּעַל מְנָת:
When [a man] divorces [his wife] according to a conditional arrangement, and the condition is fulfilled, the divorce is effective. If the condition is not fulfilled, the divorce is not effective. All the laws governing conditional agreements have been explained in Hilchot Ishut, Chapter 6. There it is explained that when [a man] divorces [his wife] according to a conditional arrangement, and the condition is fulfilled, the divorce is effective from the time the condition is fulfilled, and not from the time the get is given to her. As such, a husband may nullify a get, add to his conditions or add a further condition, until the original condition is fulfilled although [the woman] has already been given the get. If the husband dies [before the condition is fulfilled], or the get is lost or consumed by fire before the condition is fulfilled, the divorce is not effective. A priori, [the woman] should not remarry until the condition is fulfilled. If, however, she has already married, she need not leave [her second husband], unless she is no longer able to fulfill [the condition]. [For since] the condition is nullified [the divorce is void.] There it is explained that if [the husband] tells [his wife]: "You are divorced from the present time - or from today - on the following condition," or "You are divorced on the condition that this and this be done," when the condition is fulfilled the divorce becomes effective retroactively from the time the get reaches the woman. Therefore, once the get reaches the woman's possession, [the husband] can no longer nullify the get, add to his conditions or add a further condition. If the get is lost or consumed by fire, or even if the husband dies before the condition is fulfilled, she should fulfill the condition after his death, and the divorce is considered effective from the time the get was given to her. A priori, [the woman] may remarry even before the condition is fulfilled. We do not suspect that she will not fulfill the condition, because it was stated using the wording "From this time" or "On the condition that...."
