Reference for Yevamot 125:3

ואמר רבי אלעזר מאי דכתיב (בראשית ב, יח) אעשה לו עזר כנגדו זכה עוזרתו לא זכה כנגדו ואיכא דאמרי ר' אלעזר רמי כתיב כנגדו וקרינן כניגדו זכה כנגדו לא זכה מנגדתו

If he was worthy she is a help to him;<span class="x" onmousemove="('comment',' [H], 'help'. ');">⁷</span> if he was not worthy she is against him.<span class="x" onmousemove="('comment',' [H], meet for him may also be rendered 'against him'. ');">⁸</span> &nbsp; &nbsp; Others say: R. Eleazar pointed out a contradiction: It is written <i>kenegedo</i><span class="x" onmousemove="('comment',' [H] (rt. [H], 'to strike'). ');">⁹</span>

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