Halakhah for Sanhedrin 151:1
מה להיא שכן אמה בשרפה תאמר בהוא שאמו בסקילה
[Thus]: Why is her case [i.e., his wife's maternal grandmother forbidden]? Because her mother is [forbidden] on pain of death by fire. But can you say the same in his case, seeing that his mother is forbidden on pain of stoning [only]? Further, his maternal grandmother is like her's: just as in the latter case no distinction is drawn between his wife's maternal grandmother and her [his wife's] daughter,<span class="x" onmousemove="('comment',' Incest with both being punishable by fire. ');"><sup>1</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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