Talmud for Shevuot 5:5
גָּנַבְתָּ אֶת שׁוֹרִי, וְהוּא אוֹמֵר לֹא גָנַבְתִּי, מַשְׁבִּיעֲךָ אָנִי, וְאָמַר אָמֵן, חַיָּב. גָּנַבְתִּי אֲבָל לֹא טָבַחְתִּי וְלֹא מָכָרְתִּי, מַשְׁבִּיעֲךָ אָנִי, וְאָמַר אָמֵן, פָּטוּר. הֵמִית שׁוֹרְךָ אֶת שׁוֹרִי, וְהוּא אוֹמֵר לֹא הֵמִית, מַשְׁבִּיעֲךָ אָנִי, וְאָמַר אָמֵן, חַיָּב. הֵמִית שׁוֹרְךָ אֶת עַבְדִּי, וְהוּא אוֹמֵר לֹא הֵמִית, מַשְׁבִּיעֲךָ אָנִי, וְאָמַר אָמֵן, פָּטוּר. אָמַר לוֹ, חָבַלְתָּ בִי וְעָשִׂיתָ בִּי חַבּוּרָה, וְהוּא אוֹמֵר לֹא חָבַלְתִּי וְלֹא עָשִׂיתִי בְךָ חַבּוּרָה, מַשְׁבִּיעֲךָ אָנִי, וְאָמַר אָמֵן, חַיָּב. אָמַר לוֹ עַבְדּוֹ, הִפַּלְתָּ אֶת שִׁנִּי וְסִמִּיתָ אֶת עֵינִי, וְהוּא אוֹמֵר לֹא הִפַּלְתִּי וְלֹא סִמִּיתִי, מַשְׁבִּיעֲךָ אָנִי, וְאָמַר אָמֵן, פָּטוּר. זֶה הַכְּלָל, כָּל הַמְשַׁלֵּם עַל פִּי עַצְמוֹ, חַיָּב. וְשֶׁאֵינוֹ מְשַׁלֵּם עַל פִּי עַצְמוֹ, פָּטוּר:
"You stole my ox." "I did not steal it." "I beswear you." "Amen" — he is liable. "I stole it, but I did not slaughter it and I did not sell it." "I beswear you." "Amen" — he is liable. "Your ox killed my bondsman." "It did not." "I beswear you." "Amen" — he is not liable, [this being knass. For he pays thirty selaim even if he is worth only a dinar.] "You struck me and wounded me." "I did not strike and wound you." "I beswear you." "Amen" — he is liable. If his bondsman said to him: "You knocked out my tooth and blinded my eye." "I did not." "I beswear you." "Amen" — he is not liable, [this being knass. For his bondsman goes free for (loss of) one of his limbs.] This is the rule: Whoever pays by his own admission is liable; whoever does not pay by his own admission is not liable.