Mishnayos Shevuos Perek 7 Mishnah 1

All those who take an oath that is legislated by the Torah take an oath and do not pay. By Torah law, one takes an oath only in order to exempt himself from a monetary claim. And these litigants take a rabbinically instituted oath and receive possession of the disputed funds or property, i.e., their claim is upheld by means of the oath, even though they are not in possession of the property in question: A hired worker who claims that he has not received his wages; and one who was robbed and sues the person who robbed him; and one who was injured, who claims compensation from the person who injured him; and one whose opposing litigant is suspect with regard to the taking of an oath. When a person suspected of taking false oaths is liable to take an oath in order to exempt himself, the claimant takes an oath instead and receives payment. And a storekeeper relying on his ledger also takes an oath and is paid. How does this halakha apply to the hired worker? The case is where one says to his employer: Give me my wages that are still in your possession. The employer says: I already gave them to you. And that worker says: I have not received them. In such a case, the worker takes an oath that he has not received his wages, and he receives payment from his employer. Rabbi Yehuda says: This oath cannot be administered unless there is partial admission on the part of the employer. How so? The case is where the worker said to him: Give me my wages, fifty silver dinars, which are still in your possession. And the employer says: You have already received one golden dinar, which is worth twenty-five silver dinars. Since the employer has admitted that he owes part of the sum, the worker takes an oath and is paid the whole sum.

כָּל הַנִּשְׁבָּעִין שֶׁבַּתּוֹרָה, נִשְׁבָּעִין וְלֹא מְשַׁלְּמִין. וְאֵלּוּ נִשְׁבָּעִין וְנוֹטְלִין, הַשָּׂכִיר, וְהַנִּגְזָל, וְהַנֶּחְבָּל, וְשֶׁכְּנֶגְדּוֹ חָשׁוּד עַל הַשְּׁבוּעָה, וְהַחֶנְוָנִי עַל פִּנְקָסוֹ. הַשָּׂכִיר כֵּיצַד, אָמַר לוֹ תֶּן לִי שְׂכָרִי שֶׁיֵּשׁ לִי בְיָדֶךָ, הוּא אוֹמֵר נָתַתִּי, וְהַלָּה אוֹמֵר לֹא נָטַלְתִּי, הוּא נִשְׁבָּע וְנוֹטֵל. רַבִּי יְהוּדָה אוֹמֵר, עַד שֶׁתְּהֵא שָׁם מִקְצָת הוֹדָאָה. כֵּיצַד, אָמַר לוֹ תֶּן לִי שְׂכָרִי חֲמִשִּׁים דִּינָר שֶׁיֵּשׁ לִי בְיָדֶךָ, וְהוּא אוֹמֵר הִתְקַבַּלְתָּ דִינַר זָהָב: