Reference for Bava Batra 252:2

שלחו מתם בכור שמכר קודם חלוקה לא עשה כלום אלמא אין לו לבכור קודם חלוקה והלכתא יש לבכור קודם חלוקה

holds the opinion [that Raba's meaning was that] the entire [sale was invalid].<span class="x" onmousemove="('comment',' Because, according to R. Papa, the firstborn does not come into the possession of his share heir the distribution had taken place. ');">⁴</span> [A message] was sent from Palestine:<span class="x" onmousemove="('comment',' Lit., 'from there'. ');">⁵</span> [If] a firstborn son had sold [his share] before the division [of the estate took place, that sale] is invalid.<span class="x" onmousemove="('comment',' V. note 3. ');">⁶</span>

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