Tafsiran Bilangan 5:13: Rashi, Sforno, Rashbam & Siftei Chakhamim

וְשָׁכַ֨ב אִ֣ישׁ אֹתָהּ֮ שִׁכְבַת־זֶרַע֒ וְנֶעְלַם֙ מֵעֵינֵ֣י אִישָׁ֔הּ וְנִסְתְּרָ֖ה וְהִ֣יא נִטְמָ֑אָה וְעֵד֙ אֵ֣ין בָּ֔הּ וְהִ֖וא לֹ֥א נִתְפָּֽשָׂה׃

dan seorang laki-laki bersetubuh dengannya, tetapi hal itu tersembunyi dari mata suaminya; perempuan itu telah menyendiri secara diam-diam dan menjadi najis, tetapi tidak ada saksi terhadapnya, dan ia tidak dipaksa,

Rashi

ושכב איש AND A MAN LIETH [WITH HER] — a man, thus excluding a minor and a being that does not come under the term איש (i. e., an animal) (Sifrei Bamidbar 7:2; Sotah 24a).
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Sforno

ושכב איש אותה, and another man has lain with her It is characteristic of the evil urge to cause the sinner to proceed from a relatively mild sin to ever more serious sins.
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Rashbam

ועד אין בה, to testify that she had been guilty of adultery,
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Rashi

אתה שכבת זרע [AND A MAN LIETH] WITH HER CARNALLY — This implies: that only her sexual intercourse with another man makes her unfit for continuing in marital relation with her husband, but the fact that her sister had sexual intercourse with him does not make her unfit for such (Yevamot 95a) [as was once the case with two sisters who greatly resembled each other (Tanchuma 5:2:6)]
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