Talmud sobre Ketubot 13:4
הַטּוֹעֵן אֶת חֲבֵרוֹ כַדֵּי שֶׁמֶן, וְהוֹדָה בַקַּנְקַנִּים, אַדְמוֹן אוֹמֵר, הוֹאִיל וְהוֹדָה בְמִקְצָת הַטַּעֲנָה, יִשָּׁבֵעַ. וַחֲכָמִים אוֹמְרִים, אֵין זוֹ הוֹדָאָה מִמִּין הַטַּעֲנָה. אָמַר רַבָּן גַּמְלִיאֵל, רוֹאֶה אֲנִי אֶת דִּבְרֵי אַדְמוֹן:
Si uno le dice a su amigo jarras de aceite, y él admite [vacías] jarras, [sin aceite, como cuando su amigo dice: "Me debes diez jarras de aceite"], Admon dice: Dado que admite parte de la reclamar, él jura. [El reclamo connota petróleo y jarras, por lo que su admisión a las jarras vacías constituye una admisión parcial, lo que implica un juramento. ] Y los sabios dicen: Esto no constituye una admisión similar a la naturaleza del reclamo. [El reclamo connota petróleo solo en la cantidad de diez lanzadores, de modo que cuando admite que vacía los lanzadores, "lo que se reclama no se admite y lo que se admite no se reclama", de modo que no hay admisión similar a la naturaleza del reclamar, y no se implica un juramento. ] R. Gamliel dice: Me suscribo a las palabras de Admon. [La halajá está de acuerdo con Admon.]
Jerusalem Talmud Shevuot
If somebody sued for both vessels and real estate; if [the other] admitted the vessels but denied the real estate, or the real estate and denied the vessels, he is not liable69One does not swear on claims of real estate (Mishnah 1). Therefore if the defendant acknowledged his debt of vessels, there is nothing left to take the oath. If he disputes all claims to vessels, there is no acknowledgment since admission of the duty to hand over real estate does not count.. If he admitted part of the real estate he is not liable69One does not swear on claims of real estate (Mishnah 1). Therefore if the defendant acknowledged his debt of vessels, there is nothing left to take the oath. If he disputes all claims to vessels, there is no acknowledgment since admission of the duty to hand over real estate does not count.. Part of the vessels he is liable since non-guaranteed property obligates guaranteed property to be sworn about70Mishnah Qiddušin1:5, Note 474. If the defendant is liable to take an oath, the claimant can add to the oath all of his outstanding claims even if they in themselves would not force an oath. This is known as “rolling over of oaths.”
A property is guaranteed if the seller as a matter of routine must guarantee the title to the property; this is the case with real estate..