אבן העזר קי״דEven HaEzer 114

Se’if 1א׳

הַנּוֹשֵׂא אִשָּׁה, וּפָסְקָה עִמּוֹ לָזוּן אֶת בִּתָּהּ חָמֵשׁ שָׁנִים, חַיָּב לְזוּנָהּ בְּמַאֲכָל וּבְמַשְׁקֶה חָמֵשׁ שָׁנִים הָרִאשׁוֹנִים שֶׁאַחַר הַנִּשּׂוּאִין, בֵּין אִם הַמְּזוֹנוֹת בְּיֹקֶר אוֹ בְּזוֹל. וְאִם לֹא זָנָהּ בָּהֶם, וְהוּזְלוּ הַמְּזוֹנוֹת, אִם הוּא עִכֵּב צָרִיךְ לִפְרֹעַ לָהּ כִּזְמַן הַיֹּקֶר. וְאִם הִיא עִכְּבָה, אֵינוֹ נוֹתֵן לָהּ אֶלָּא בִּזְמַן הַזּוֹל. וְאִם הָיוּ בְּזוֹל וְהוּקְרוּ, אֲפִלּוּ אִם עִכֵּב הוּא, אֵינוֹ נוֹתֵן לָהּ אֶלָּא כִּדְמֵי הַזּוֹל:

If a man married a woman and agreed that he would feed her daughter for five years, he must provide food and drink for the first five years of the marriage, whether food prices are high or low. If he did not feed her during those years, and food prices dropped - if he had withheld [the food] he must pay her according to the higher prices., but if she prevented him [from providing the food], he only pays her according to the lower prices. If food prices rose, even if he had withheld the food, he only pays according to the lower prices.

Se’if 2ב׳

אַף עַל פִּי שֶׁהוּא זָנָהּ, מַעֲשֵׂה יָדֶיהָ שֶׁלָּהּ:

Even though he provides her with food, she keep her own handiwork.

Se’if 3ג׳

אִם הָאֵם פְּטָרוֹ מִלְּזוּנָהּ, אֵין הַפִּטּוּר כְּלוּם:

If the mother exempts him from paying, her exemption counts for nothing.