8מִי שֶׁלָּוָה מֵאֶחָד וְאַחַר כָּךְ מָכַר הַלּוֶֹה נְכָסָיו לִשְׁנַיִם וְכָתַב בַּעַל חוֹב לְלוֹקֵחַ שֵׁנִי דִּין וּדְבָרִים אֵין לִי עִמְּךָ וְקָנוּ מִיָּדוֹ אֵינוֹ יָכוֹל לִטְרֹף מִלּוֹקֵחַ רִאשׁוֹן שֶׁהֲרֵי אוֹמֵר לוֹ הִנַּחְתִּי לְךָ מָקוֹם לִגְבּוֹת מִמֶּנּוּ אֵצֶל בַּעַל חוֹבְךָ מִן הַנְּכָסִים שֶׁקָּנָה לוֹקֵחַ שֵׁנִי אַחֲרַי וְאַתָּה הִפְסַדְתָּ עַל עַצְמְךָ שֶׁהֲרֵי סִלַּקְתָּ עַצְמְךָ מֵהֶן. וְהוּא הַדִּין לְאִשָּׁה בִּכְתֻבָּתָהּ אִם כָּתְבָה לַשֵּׁנִי. אִבְּדָה כְּתֻבָּתָהּ וְאֵינָהּ יְכוֹלָה לִטְרֹף. אֲבָל אִם כָּתְבוּ לָרִאשׁוֹן טוֹרְפִין מִן הַשֵּׁנִי. מָכַר הַלּוֶֹה שָׂדֶה לַלּוֹקֵחַ וּמְכָרָהּ לוֹקֵחַ רִאשׁוֹן לְלוֹקֵחַ שֵׁנִי וְכָתַב הַמַּלְוֶה לְלוֹקֵחַ רִאשׁוֹן דִּין וּדְבָרִים אֵין לִי עִמְּךָ וְקָנוּ מִיָּדוֹ הֲרֵי בַּעַל חוֹב טוֹרֵף מִלּוֹקֵחַ שֵׁנִי אוֹתָהּ הַשָּׂדֶה וְלוֹקֵחַ רִאשׁוֹן טוֹרֵף אוֹתָהּ מִבַּעַל חוֹב שֶׁהֲרֵי כָּתַב לוֹ וְלוֹקֵחַ שֵׁנִי טוֹרֵף אוֹתָהּ מִלּוֹקֵחַ רִאשׁוֹן שֶׁהֲרֵי הוּא מְכָרָהּ לוֹ וּבַעַל חוֹב חוֹזֵר וְטוֹרֵף מִשֵּׁנִי וְחוֹזְרִין חֲלִילָה עַד שֶׁיַּעֲשׂוּ פְּשָׁרָה בֵּינֵיהֶן. וְכֵן הָאִשָּׁה בִּכְתֻבָּתָהּ:
As reflected in the following situation, when a person limits his power to expropriate property, his waiver may extend beyond his original intent: One person borrowed money from a colleague. Afterwards, the borrower sold his property to two people each person purchasing a portion for himself, one after the other. The creditor wrote to the second purchaser, pledging that he would not expropriate the property as payment for the debt and affirmed his commitment with a kinyan. Our Sages ruled that he is also not able to expropriate the property sold to the first purchaser. For that purchaser will say to the creditor: "I left you the opportunity of collecting the money owed you from the debtor by expropriating the property that the second purchaser bought after I did. You caused yourself a loss by removing your lien on it." Similar laws apply with regard to a woman who seeks to collect the money due her by virtue of her ketubah. If she writes such a waiver to the second purchaser, she loses the right to the money due her by virtue of her ketubah and cannot expropriate property. If, however, such persons write such a waiver to the first purchaser, they may expropriate the property from the second purchaser. The following situation can occur when a borrower sells a field to a purchaser and then the purchaser sells it to a second purchaser. The lender writes to the first purchaser, pledging that he would not expropriate the property as payment for the debt and affirms his commitment with a kinyan. The creditor may expropriate the property from the second purchaser. The first purchaser may expropriate the property from the creditor, because he pledged that he would not expropriate the property, and he did. The second purchaser can then expropriate the property from the first purchaser, because he sold it to him. The creditor may then expropriate the property again from the second purchaser, and the cycle continues until they arrange a compromise. Similar laws apply with regard to a woman who seeks to collect the money due her by virtue of her ketubah and makes a pledge to the person who purchased her husband's property.
