Leviticus 18:10 - Ellicott's Commentary On The Whole Bible

The nakedness of thy son’s daughter. From this prohibition it is inferred that a man must not marry his own daughter. If a granddaughter, who is a degree further removed from him, is proscribed, how much more his own daughter. Hence the canonical law during the second Temple deduced from this passage that “whoso companieth with a woman, even by way of fornication, and begetteth a daughter, she is forbidden to him.” Still, when the mother is expressly forbidden to the son (see Leviticus 18:7), it is strange that the daughter should have been passed over in silence, and be left to inference. It is therefore more than probable that a word has dropped out of the text, and that originally it stood here, “the nakedness of thy daughter and of thy son’s daughter,” &c. That this is not a solitary instance where the text has suffered from disarrangement we shall presently have occasion to see in Leviticus 18:11.