Reference for Yevamot 72:4

ר' יוחנן אמר לא קנה לוקח קנין פירות כקנין הגוף דמי

If the son sold it, the buyer has no claim whatsoever upon it until the father's death.<span class="x" onmousemove="('comment',' B.K. 88b, B.B. 1362. ');">¹⁰</span> And it was stated: If the son sold the estate<span class="x" onmousemove="('comment',' Assigned to him by his father for possession after his death. ');">¹¹</span> during the lifetime of his father, and died while his father was still alive, R. Johanan said: The buyer does not acquire ownership;<span class="x" onmousemove="('comment',' Even after the father's death, since the estate has never come into the son's possession. ');">¹²</span>

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