Leviticus 18:10

You shall not uncover the nakedness of your son’s daughter or of your daughter’s daughter , for their nakedness is your own nakedness .

“‘Do not have sexual relations with your son`s daughter or your daughter`s daughter; that would dishonor you.

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.