Sourcery (Wikipedia) Sourcery is a fantasy novel by British writer Terry Pratchett, the fifth book in his Discworld series, published in 1988.
If a man betroth a girl to his son, and his son have intercourse with her, but he (the father) afterward defile her, and be surprised, then he shall be bound and cast into the water (drowned).
If the wife of one man on account of another man has their mates (her husband and the other man’s wife) murdered, both of them shall be impaled.