"6 None of you shall approach to any that is near of kin to him, to uncover their nakedness: I am the LORD. 7 The nakedness of thy father, or the nakedness of thy mother, shalt thou not uncover: she is thy mother; thou shalt not uncover her nakedness. 8 The nakedness of thy father’s wife shalt thou not uncover: it is thy father’s nakedness. 9 The nakedness of thy sister, the daughter of thy father, or daughter of thy mother, whether she be born at home, or born abroad, even their nakedness thou shalt not uncover. 10 The nakedness of thy son’s daughter, or of thy daughter’s daughter, even their nakedness thou shalt not uncover: for theirs is thine own nakedness. 11 The nakedness of thy father’s wife’s daughter, begotten of thy father, she is thy sister, thou shalt not uncover her nakedness. 12 Thou shalt not uncover the nakedness of thy father’s sister: she is thy father’s near kinswoman. 13 Thou shalt not uncover the nakedness of thy mother’s sister: for she is thy mother’s near kinswoman. 14 Thou shalt not uncover the nakedness of thy father’s brother, thou shalt not approach to his wife: she is thine aunt. 15 Thou shalt not uncover the nakedness of thy daughter in law: she is thy son’s wife; thou shalt not uncover her nakedness. 16 Thou shalt not uncover the nakedness of thy brother’s wife: it is thy brother’s nakedness. 17 Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son’s daughter, or her daughter’s daughter, to uncover her nakedness; for they are her near kinswomen: it is wickedness. 18 Neither shalt thou take a wife to her sister, to vex her, to uncover her nakedness, beside the other in her life time." — Leviticus 18:6-18 KJV.
PROHIBITION OF INCESTUOUS MARRIAGES, 6-18.These fall into three classes: 1.) blood-relationships proper, 7-13; 2.) the wives of blood-relations, 14-16; 3.) the blood relations of the wife. This prohibition is not grounded on the eternal principles of absolute morality, since the command to “multiply and replenish the earth” must have involved the marriage of brothers and sisters in the family of Adam, and since, also, Abraham married his half sister, Jacob two sisters at a time, Amram his aunt Jochebed, and Judah married Tamar, the widow of his own son, with no indication of the divine disapproval; and by the commandment of the Levitical law the brother must marry the wife of his deceased childless brother. Still it must be confessed that the horror naturalis, or revulsion of feeling at the thought of marrying one’s mother or daughter is very closely allied to the abhorrence of the violation of the seventh commandment.

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