Thematic Bible: Betrothal of, a quasi-marriage

If a maiden who is a virgin is engaged to be married, and a man finds her in the city and lies with her, Then you shall bring them both out to the gate of that city and shall stone them to death -- "the young woman because she did not cry for help though she was in the city, and the man because he has violated his neighbor's [promised] wife. So shall you put away evil from among you.