Reference for Sanhedrin 105:20

אלא חייבי לאוין ור' יהודה סבר לה כרבי עקיבא דאמר אין קידושין תופסין בחייבי לאוין

R. JUDAH SAID: HE IS LIABLEIN RESPECT OF HER AS HIS MOTHER ONLY. ONE WHO COMMITS INCEST WITH HIS FATHER'SWIFE INCURS A PENALTY IN RESPECT OF HER BOTH AS HIS FATHER'S WIFE, AND ASA MARRIED WOMAN. [HE IS GUILTY IN RESPECT OF THE FORMER] BOTH DURING HISFATHER'S LIFETIME AND AFTER HIS DEATH, WHETHER SHE WAS WIDOWED FROMERUSIN<span class="x" onmousemove="('comment',' V. p. 333, n. 3. ');">¹⁹</span>

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