Reference for Sanhedrin 151:19
אמר אביי אמר קרא (ויקרא כא, ט) את אביה היא מחללת מי שמחללת את אביה יצתה זו שאביה מחללה
The father of R. Abin learned: Because we have no express sanction [from Scripture that incest] with an illegitimate daughter [is punished by burning], therefore the Writ must say, And the daughter of a man [and] a priest, if she profane herself through her father, she profaneth him; she shall burnt with fire.<span class="x" onmousemove="('comment',' Lev. XXI, 9. 'A man' Is superfluous, and therefore teaches that even if she is only his daughter, not his wife's, this law holds good. By translating the rest of the verse as in the text, we deduce that an illegitimate daughter is burnt for incest with her father; and by regarding 'a man' as distinct from 'priest' (the latter being attached to the former with the copula 'and'), the deduction is made to refer to any illegitimate daughter, not only a priest's (v. Tosef. Sanh. XII). ');"><sup>18</sup></span>