Reference for Yevamot 220:7

אלא לאו בחרש מעיקרא ומדהוא חרש מעיקרא היא נמי חרשת מעיקרא ומדאחיות חרשות מעיקרא נכריות נמי חרשות מעיקרא ותנן גבי נכריות כונס אין חולץ לא אישתיק

If he became deaf or insane he may never divorce her.<span class="x" onmousemove="('comment',' Infra 112b; because his marriage which took place when he was in full possession of his senses was Pentateuchally valid, while a divorce given by him while deaf or insane would have no Pentateuchal validity. ');">¹⁸</span> Consequently it must be a case of a man<span class="x" onmousemove="('comment',' Lit., 'but not?' ');">¹⁹</span> who was originally<span class="x" onmousemove="('comment',' Prior to the marriage. ');">²⁰</span>

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