Reference for Bekhorot 104:1

לאיתויי שבחא דממילא חפורה והוו שובלי שלפופי והוו תמרי:

This implies even an improvement in the value of the estate which comes of itself.<span class="x" onmousemove="('comment',' And without any expense of labour or money on the part of the plain heir.');">¹</span>

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