Reference for Bava Batra 247:7

ורבי נמי הכתיב לתת לו ההוא שאם אמר איני נוטל ואיני נותן רשאי

agree that [the firstborn] takes [a double portion].<span class="x" onmousemove="('comment',' Since no radical change had taken place in the tree. ');">¹⁸</span> The dispute only relates to [the case] where hafurah<span class="x" onmousemove="('comment',' Corn in its earliest stage, used as fodder for cattle. ');">¹⁹</span> turned into [well developed] ears of corn, [or where] undeveloped dates turned into [fully developed] dates. [One] Master<span class="x" onmousemove="('comment',' Rabbi. ');">²⁰</span>

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