Halakhah for Sanhedrin 151:3
ולמאן דאמר סקילה חמורה מהאי קושיא לא נידונה
Whilst on the view that stoning is severer, the analogy cannot be made on account of this last difficulty.<span class="x" onmousemove="('comment',' Since according to this comparison incest with his maternal grandmother is punished by burning. But his maternal grandmother should also be compared to his mother, the punishment for which is stoning; hence the entire analogy falls to the ground. ');"><sup>3</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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