Cross reference
Leviticus 20:21
21 "'If a man takes his brother's wife, it is an impurity: he has uncovered his brother's nakedness; they shall be childless.
Leviticus 18:16
16 "'You shall not uncover the nakedness of your brother's wife: it is your brother's nakedness.
Matthew 14:3-4
3 For Herod had laid hold of John, and bound him, and put him in prison for the sake of Herodias, his brother Philip's wife.
4 For John said to him, "It is not lawful for you to have her."