Rashi on Deuteronomy 22:26/רש"י על דברים כ״ב:כ״ו

1כי כאשר יקום וגו׳ FOR AS WHEN A MAN RISETH [AGAINST HIS FELLOW MAN, AND SLAYETH HIM, EVEN SO IS THIS THING] — According to its plain sense the following is what it implies: there is in the damsel no sin deserving death, because she was coerced and he, (the man) attacked her with violence, just as when a man attacks his fellowman to kill him. — Our Rabbis, however, gave it (the verse) a Halachic interpretation as follows: Behold, this simile is intended to elucidate the law in question but at the same time turns out to be itself elucidated by that law (lit., this comes as a teacher and is found to be a learner) (Sanhedrin 73a).