Commentary for Bava Batra 246:7

האי הזרוע והלחיים והקיבה היכי דמי אי דאתי לידי אבוהון פשיטא ואי דלא אתי לידי אבוהון ראוי הוא ואין הבכור נוטל בראוי כבמוחזק

How [is this to be understood]? — [If] their father had bequeathed to them a cow [that was] rented out to others [for half profit], or given on hire [at a fixed rate], or feeding in the meadow, and it gave birth to a firstling, he<span class="x" onmousemove="('comment',' The firstborn. ');">¹⁸</span> takes [in it] a double portion;<span class="x" onmousemove="('comment',' Since the appreciation was natural, it is regarded as having formed part in the original estate in their father's lifetime. ');">¹⁹</span> but if they<span class="x" onmousemove="('comment',' The heirs. ');">²⁰</span>

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