Tractate Sanhedrin, Herbert Danby tr. , at sacred-texts.com
M.6c. "The false witnesses against a priest's daughter, and the one who is her paramour":--all false witnesses are subject to the same death penalty (to which the accused has been made liable) except in the case of the false witnesses against the priest's daughter and her paramour (who are to be strangled). 2
141:2 The law of the false witness is derived from Deut. 19. 16 ff. On the "priest's daughter," see Mishnah IX. 1. Scripture (Lev. 21. 9) is silent as to the fate of the paramour; but since it must be assumed that he is to be put to death, and none of the three Biblical methods is authorized, "strangling" must be employed. See p. 95, note 3.