גיטין ה׳Gittin 5

Mishnah 3ג׳

אֵין מוֹצִיאִין לַאֲכִילַת פֵּרוֹת וּלְשֶׁבַח קַרְקָעוֹת וְלִמְזוֹן הָאִשָּׁה וְהַבָּנוֹת מִנְּכָסִים מְשֻׁעְבָּדִים, מִפְּנֵי תִקּוּן הָעוֹלָם. וְהַמּוֹצֵא מְצִיאָה, לֹא יִשָּׁבַע, מִפְּנֵי תִקּוּן הָעוֹלָם:

We do not extract [payment] for usufruct, for the improvement of the land, or for the food of a wife and daughters [of a former marriage] from mortgaged property, due to repairing the world [Tikkun HaOlam]. And we do not impose an oath upon the finder of an object due to Tikkun HaOlam.

Mishnah 4ד׳

יְתוֹמִים שֶׁסָּמְכוּ אֵצֶל בַּעַל הַבַּיִת אוֹ שֶׁמִּנָּה לָהֶן אֲבִיהֶן אַפּוֹטְרוֹפּוֹס, חַיָּב לְעַשֵּׂר פֵּרוֹתֵיהֶן. אַפּוֹטְרוֹפּוֹס שֶׁמִּנָּהוּ אֲבִי יְתוֹמִים, יִשָּׁבֵעַ. מִנָּהוּ בֵית דִּין, לֹא יִשָּׁבֵעַ. אַבָּא שָׁאוּל אוֹמֵר, חִלּוּף הַדְּבָרִים. הַמְטַמֵּא וְהַמְדַמֵּעַ וְהַמְנַסֵּךְ בְּשׁוֹגֵג, פָּטוּר. בְּמֵזִיד, חַיָּב. הַכֹּהֲנִים שֶׁפִּגְּלוּ בַמִּקְדָּשׁ מְזִידִין, חַיָּבִין:

[With regard to] orphans who are dependent on a [particular] homeowner, or [in the case that] their father had appointed a guardian for them, these people must tithe the [orphans'] fruit. A guardian who was appointed by the father, must take an oath; if the court appointed him need not take an oath. Abba Shaul says, "It is just the reverse." [With regard to] one who renders [fruit belonging to another] ritually impure, or mixes it [with terumah, a portion of a crop given to a Kohen which becomes holy upon separation, and can only be consumed by Kohanim or their household], or mixes [his wine with other wine used for idolatrous] libations. [If he did so] unwittingly, he is exempt [from paying damages]; if on purpose, he is liable. Kohanim who purposely render sacrifices ‏pigul [a sacrifice that becomes unfit, due to the intention of the officiating priest, while offering it, to consume it outside its permitted time], are liable.