Bava Metzia1: 2
הָיוּ שְׁנַיִם רוֹכְבִין עַל גַּבֵּי בְהֵמָה, אוֹ שֶׁהָיָה אֶחָד רוֹכֵב וְאֶחָד מַנְהִיג, זֶה אוֹמֵר: ,,כֻּלָּהּ שֶׁלִּי”, וְזֶה אוֹמֵר: ,,כֻּלָּהּ שֶׁלִּי” — זֶה יִשָּׁבַע שֶׁאֵין לוֹ בָהּ פָּחוֹת מֵחֶצְיָהּ, וְזֶה יִשָּׁבַע שֶׁאֵין לוֹ בָהּ פָּחוֹת מֵחֶצְיָהּ, וְיַחֲלֹקוּ.  בִּזְמַן שֶׁהֵם מוֹדִים, אוֹ שֶׁיֵּשׁ לָהֶן עֵדִים — חוֹלְקִים בְּלֹא שְׁבוּעָה.
[If] two were riding an animal, or [if] one was riding and the other was leading, [and] one says: “It is all mine,” and the other says, “It is all mine” —- this one must swear that he owns no less of it than half, and that one must swear that he owns not less of it than half, and they divide [it].  Whenever they admit or they have witnesses, they divide without an oath.