Reference for Sanhedrin 99:13
מדאפקיה רחמנא לנשואה בת כהן מכלל נשואה בת ישראל מחנק לשריפה ש"מ שריפה חמורה
Burning is severer than strangulation, since it is the punishment of a priest'sadulterous daughter, the enormity of whose offence has already been stated.On the contrary, is not strangulation severer, since it is the punishmentof one who smites his father or mother, the greater enormity of whose offencelies in the fact that their honour is assimilated to that of the Omnipresent?— Since the Divine Law varied the penalty of a nesu'ah, if a priest's daughter,from that of a nesu'ah, if an Israelite's daughter, from strangling to burning,we may conclude that burning isseverer.<span class="x" onmousemove="('comment',' The sin of a priest's daughter is greater than that of an Israelite's daughter, since the former profanes her father in addition to disgracing herself. ');"><sup>13</sup></span>