And if a man shall take his brother's wife, it is an unclean thing: he has uncovered his brother's nakedness; they shall be childless.
his brother's
Leviticus 18:16 You shall not uncover the nakedness of your brother's wife: it is your brother's nakedness.
Matthew 14:3,4 For Herod had laid hold on John, and bound him, and put him in prison for Herodias' sake, his brother Philip's wife...
an unclean thing [heb] a separation