Commentary for Sanhedrin 149:20

אלא אם חמיו כאם חמותו השתא אם חמותו לא קמה לן אם חמיו מיהדר עלה

But these are simultaneously derived!<span class="x" onmousemove="('comment',' From the gezarah shawah of zimmah. ');">¹⁶</span> Again, if it means that his father-in-law's mother is as his mother-in-law's mother:<span class="x" onmousemove="('comment',' Thus teaching that incest with both is punished by fire. ');">¹⁷</span> but seeing that the latter is as yet unproven, why demonstrate that the former is equal thereto?<span class="x" onmousemove="('comment',' At this stage, nothing has been adduced to shew that incest with his mother-in-law's mother is thus punished, for 'a woman' has been translated literally. Consequently, only his mother-in-law is forbidden in this verse. ');">¹⁸</span>

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