Cross reference
Leviticus 20:21
21 `And a man who taketh his brother's wife -- it `is' impurity; the nakedness of his brother he hath uncovered; childless they are.
Leviticus 18:16
16 `The nakedness of thy brother's wife thou dost not uncover; it `is' thy brother's nakedness.
Matthew 14:3-4
3 For Herod having laid hold on John, did bind him, and did put him in prison, because of Herodias his brother Philip's wife,
4 for John was saying to him, `It is not lawful to thee to have her,'