Commentators explain that this verse provides a crucial protection for a female servant. If her master failed to do one of three things—marry her himself, give her to his son, or allow her to be redeemed by another Hebrew—he was required to set her free. This wasn't a punishment for her; it was her right. She would 'go out for nothing,' meaning her freedom was granted without any cost or debt, mitigating harsh customs and ensuring justice.