Leviticus 20:20-23

²⁰And the man that lieth with his uncle's wife, hath uncovered his uncle's nakedness: their sin shall they bear; childless shall they die.

²¹And if a man do take his brother's wife, it is an abominable act: the nakedness of his brother hath he uncovered; childless shall they remain.

²²And keep ye all my statutes, and all my ordinances, and do them; that the land, whither I bring you to dwell therein, may not vomit you forth.

²³And ye shall not walk in the customs of the nation which I cast out before you; for all these things they committed, and therefore I felt loathing for them.