17 ' If there is a man who takes his sister , his father's daughter or his mother's daughter , so that he sees her nakedness and she sees his nakedness , it is a disgrace ; and they shall be cut off in the sight of the sons of their people . He has uncovered his sister's nakedness ; he bears his guilt . 18 ' If there is a man who lies with a menstruous woman and uncovers her nakedness , he has laid bare her flow , and she has exposed the flow of her blood ; thus both of them shall be cut off from among their people . 19 ' You shall also not uncover the nakedness of your mother's sister or of your father's sister , for such a one has made naked his blood relative ; they will bear their guilt . 20 ' If there is a man who lies with his uncle's wife he has uncovered his uncle's nakedness ; they will bear their sin . They will die childless . 21 ' If there is a man who takes his brother's wife , it is abhorrent ; he has uncovered his brother's nakedness . They will be childless .
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Matthew Henry's Commentary on Leviticus 20:17-21
Commentary on Leviticus 20:10-27
(Read Leviticus 20:10-27)
These verses repeat what had been said before, but it was needful there should be line upon line. What praises we owe to God that he has taught the evil of sin, and the sure way of deliverance from it! May we have grace to adorn the doctrine of God our Saviour in all things; may we have no fellowship with unfruitful works of darkness, but reprove them.