Leviticus 20:17-21

17 If a man takes his sister, his father's daughter or his mother's daughter, and has sexual relations with her, and she consents, it is a shameful thing; they are to be cut off publicly - he has had sexual relations with his sister, and he will bear the consequences of their wrongdoing.

18 If a man goes to bed with a woman in her menstrual period and has sexual relations with her, he has exposed the source of her blood, and she has exposed the source of her blood; both of them are to be cut off from their people.

19 You are not to have sexual relations with your mother's sister or your father's sister; a person who does this has had sexual relations with his close relative; they will bear the consequences of their wrongdoing.

20 If a man goes to bed with his uncle's wife, he has disgraced his uncle sexually; they will bear the consequences of their sin and die childless.

21 If a man takes his brother's wife, it is uncleanness; he has disgraced his brother sexually; they will be childless.

Leviticus 20:17-21 Meaning and Commentary

INTRODUCTION TO LEVITICUS 20

In this chapter several laws are, repeated, enforced with a penalty annexed to them, and the breach them made capital, to deter from it, as giving seed to Molech, Le 20:1-5; going after such that have familiar spirits, or are wizards, Le 20:6; by shunning which, and other sins, a regard would be shown to holiness, Le 20:7,8; such as cursing parents, Le 20:9; committing adultery, Le 20:10; incestuous copulations, and marriages, and beastly actions, Le 20:11-21; all which it became the Israelites to avoid, lest, when come into the land of Canaan, they should be cast out of it, as the old inhabitants were for the same things, Le 20:22-24; and therefore, that they might appear to be a distinct people from others, they were to put a difference between clean and unclean creatures, Le 20:25,26; and the chapter is closed with a law, making it death for any person to have a familiar spirit, or to be a wizard, Le 19:27.