Leviticus 20:19-21
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19And thou shalt not uncover the nakedness of thy mother`s sister, nor of thy father`s sister; for he hath made naked his near kin: they shall bear their iniquity. 20And if a man shall lie with his uncle`s wife, he hath uncovered his uncle`s nakedness: they shall bear their sin; they shall die childless. 21And if a man shall take his brother`s wife, it is impurity: he hath uncovered his brother`s nakedness; they shall be childless.
Leviticus 20:19-21 (ASV)