Reference for Bava Batra 251:4

דרכום מעיקרא עינבי השתא חמרא

but where these were pressed<span class="x" onmousemove="('comment',' Into wine or oil. ');">⁷</span> [the firstborn does] not [receive a double portion].<span class="x" onmousemove="('comment',' Even though he protested; because, in this case, there was complete transformation of the original bequest. The wine or oil was never in the possession of the deceased. ');">⁸</span>

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