Leviticus 18:10

10 Thou shalt not show the filthhood of the daughter of thy son, either of thy niece, that is, the daughter of thy daughter, for it is thy filthhood. (Thou shalt not uncover the nakedness of thy son's daughter, or thy daughter's daughter, for it is thy own nakedness, that is, they be of thy own flesh.)

Leviticus 18:10 Meaning and Commentary

Leviticus 18:10

The nakedness of thy son's daughter, or of thy daughter's
daughter
A man might not marry his granddaughter, whether a descendant of his son or of his daughter, nor any further off descending from him in a right line, not his great-granddaughter, and so on; and if he might not marry his granddaughter, much less his own daughter, as Jarchi observes, for the relation is still nearer; therefore that being prohibited, this in course must, though not mentioned: [even] their nakedness thou shalt not uncover;
neither debauch nor marry such an one: for theirs [is] thine own nakedness;
which sprung from his, being the descendants either of his son or daughter; the Targum of Jonathan is,

``for they are as thy nakedness,''

his own flesh and blood.

Leviticus 18:10 In-Context

8 Thou shalt not uncover the filthhood of the wife of thy father, for it is the filthhood of thy father. (Thou shalt not uncover the nakedness of thy father's wife, for her nakedness is for thy father alone.)

9 Thou shalt not show the filthhood of thy sister, of father, either of mother (Thou shalt not uncover thy sister's nakedness, that is, thy father's daughter, or thy mother's daughter), which sister is begotten at home, that is, in wedlock, either withoutforth, that is, out of wedlock.

10 Thou shalt not show the filthhood of the daughter of thy son, either of thy niece, that is, the daughter of thy daughter, for it is thy filthhood. (Thou shalt not uncover the nakedness of thy son's daughter, or thy daughter's daughter, for it is thy own nakedness, that is, they be of thy own flesh.)

11 Thou shalt not show the filthhood of the daughter of the wife of thy father, which she childed to thy father, and she is thy sister. (Thou shalt not uncover the nakedness of the daughter of thy father's wife, whom she bare for thy father, for she is thy sister.)

12 Thou shalt not open the filthhood of thy father's sister, for she is the flesh of thy father. (Thou shalt not uncover the nakedness of thy father's sister, for she is of thy father's flesh.)