Reference for Sanhedrin 149:10

וקתני יש בכלל אשה ובתה מכלל דתרוייהו כתיבי בהדיא והנך מדרשא אתיא

But on Raba's view, that they differ about his mother-in-law after [his wife's] death,<span class="x" onmousemove="('comment',' But as to his mother-in-law's mother there is a common agreement that the prohibition is only derived and not explicitly stated. ');">⁹</span>

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