Halakhah for Sanhedrin 151:14
בתו מאנוסתו מנין האמר אביי ק"ו על בת בתו ענוש על בתו לא כל שכן
Whence do we know that his daughter by a seduced woman [not his wife] is forbidden him?<span class="x" onmousemove="('comment',' As explained by Abaye supra 75b. q.v. The difficulty arises because in Lev. XVIII, 10 q.v., which has been interpreted as referring to his illegitimate offspring, no mention is made of his own daughter. ');"><sup>13</sup></span>
Sefer HaChinukh
To not reveal the nakedness of the daughter: To not reveal the nakedness of the daughter, and this is not elucidated in the language of the Torah, that the verse would state, "The nakedness of your daughter you shall not reveal." And because of [the following] did a verse not come about it explicitly, since there is no need for it: As since the Torah forbade the daughter of the son and the daughter of the daughter which are more distant than she, there is no reason to say that she is forbidden - as it is an a fortiori argument (kal vachomer). And they, may their memory be blessed, also learned it from a inferential comparison (gezearah shavah). As if we had only extracted it with an fortiori argument, no one would have ever been judged for it - as it is established for us (Sanhedrin 76a) [that] 'we do not punish from an inference.'
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