Reference for Bekhorot 104:4

<big><strong>מתני׳</strong></big> ואלו שאין חוזרין ביובל

and afterwards became full-grown dates.<span class="x" onmousemove="('comment',' The Mishnah therefore informs us with this last clause that even in such instances where the ordinary (non first-born) heir has spent no money on or worked in any way for the improvement in the estate, the first-born takes merely an equal share with the rest of the brothers and does not enjoy the privileges of a first-born.');">⁴</span>

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