Reference for Bava Batra 227:2

איתמר קנין עד אימתי חוזר רבה אמר כל זמן שיושבין רב יוסף אמר כל זמן שעוסקין באותו ענין

how long<span class="x" onmousemove="('comment',' Lit., 'until when'. ');">⁶</span> may one withdraw?<span class="x" onmousemove="('comment',' And cancel or change the agreement. ');">⁷</span> — Rabbah said: So long as the session<span class="x" onmousemove="('comment',' Of the court that dealt with the matter. ');">⁸</span> is in progress. R. Joseph said: So long [only] as they are dealing with that subject. R. Joseph said: Logical reasoning supports my view. For Rab Judah said:<span class="x" onmousemove="('comment',' Supra 113b. ');">⁹</span>

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