Commentary for Bava Batra 260:7

במאי קמיפלגי מר סבר הלכה עדיפא ומר סבר מעשה רב

may not make [the son of the beloved] the firstborn, how much less [should he have this right in the case of] an ordinary [son] who is privileged to receive in prospective [property] as in that which is actually in [his father's] possession; hence it was expressly stated, Then it shall be, in the day that he causeth his son to inherit, [in order to make it clear that] the Torah gave a father authority to transmit his estate to whomsoever he pleases.

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