Study Bava Batra folio 126A with parallel Hebrew-English text, traditional commentary, and modern study tools. Free access to Babylonian Talmud online.
And as for a loan that is with the firstborn, i.e., he had borrowed money from his father, then his father died, it is uncertain whether the payment should be considered property due to the father or property possessed by him. Therefore, the firstborn and his brothers divide the additional portion.
§ With regard to the halakha that the firstborn is not entitled to a double portion of the enhancement of the property resulting from the actions of the heirs, Rav Huna says that Rav Asi says: A firstborn who protested the efforts of enhancing the property before it is divided has protested, and if
Rabba said: Rav Asi’s opinion is reasonable in a case where they inherited grapes on a grapevine and the brothers harvested them against the will of the firstborn, or if they inherited olives on olive trees and the brothers harvested them, as in these cases, the produce itself did not change. But i
The Talmud asks: Why is he entitled to a double portion, according to Rav Yosef, even if they treaded on them? Since the brothers transformed the produce, as initially it was in the form of grapes and now it is wine, they have acquired it in the same manner that a thief acquires an item he stole.
The Talmud answers: Rav Yosef did not mean that the firstborn is entitled to a double portion of the enhanced value of the wine. Rather, his intention was the same as that which Rav Ukva bar Ḥama says in a different context, that the ruling is referring to a case where the wine spoiled, its value de