Reference for Bava Batra 260:6

א"ר זריקא א"ר אמי א"ר חנינא אמר רבי הלכה כר' יוחנן בן ברוקה אמר ליה ר' אבא הורה איתמר

If [in the case of] a firstborn, whose rights are impaired in that he does not receive [the portion of his birthright] in prospective [property] as in that which is actually in [his father's] possession, the Torah, [nevertheless,] said, He<span class="x" onmousemove="('comment',' The father. ');">⁶</span>

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