Mesorat%20hashas for Sanhedrin 151:8

למ"ד סקילה חמורה איכא למיפרך מה להוא שכן אמו בסקילה תאמר בהיא שאמה בשרפה

so in her case is the penalty stoning. But if we regard stoning severer, this analogy can be refuted. [Thus]: Why is his [daughter-in-law forbidden]? Because his mother is forbidden him on pain of stoning: Can you then say the same of her daughter-in-law, seeing that incest with her mother incurs only death by fire?<span class="x" onmousemove="('comment',' Hence, since the prohibition of his relative, viz., his mother, is so severe, it is natural that it should extend in a downward direction too, whereas the prohibition of her relation, viz., her mother, being punished only by burning and consequently weaker, its extent may be more limited, and not embrace her daughter-in-law. ');">⁸</span>

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