Deuteronomy 22:23-24

23Perhaps a man may meet a young woman in a town. She has already promised to marry another man, but the man has sex with her.

24If so, you must take both of them to the gate of that town. You must throw stones at both of them there, until they die. The young woman is guilty because she did not shout aloud for help. They were in the town, so someone would have heard her. The man is guilty because he had sex with the future wife of another man. In this way, you will remove evil acts from among you.