Reference for Sanhedrin 151:21

אזהרה לבתו מאנוסתו מניין בשלמא לאביי ורבא מהיכא דנפקא להו עונש מהתם נפקא להו אזהרה

— Abaye answered: The Writ sayeth, she profaneth her father, teaching that this applies only to a case where she profaneth her father, excluded thus is this case,<span class="x" onmousemove="('comment',' Incest with one's illegitimate daughter. ');">²⁰</span>

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