Reference for Sotah 38:9

ורבנן בדיעבד לא פתח קרא

and when he has offered the handful, she cannot retract! — But, even on your reasoning, the teaching is inconsistent. It states: 'When he has offered the handful, she cannot retract', but is she not actually proved!<span class="x" onmousemove="('comment',' By refusing to drink before the handful was offered. ');">⁹</span>

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