Leviticus 20:17

A crime. Hebrew chesed, commonly signifies an act of piety or goodness, as if Moses intended to insinuate that such marriages were at first lawful. (Thalmud; Selden, Jur. v. 8.) But a softer term is used to denote a great impiety, as the Hebrews say to bless, when they mean to curse, or to blaspheme; (Calmet) and the Greeks call the furies Eumenides, or "the good-natured." --- One another's. Hebrew, "He hath uncovered his sister's," &c. Whether they saw what was indecent or not, if they admitted of any unlawful commerce, they were to be stoned to death. (Haydock)