Malaquías 2:12 Halajá: Shulchan Arukh, Even HaEzer

A man who has sexual relations with an idol worshiper, if zealots have not killed him and he has not received lashes at the hands of the court, his punishment is explicit in the words of tradition (Prophets), that he receives excision, as is written, “…For Judah has profaned the holiness of God which He loves, and has married the daughter of his strange god. May God cut off the man that does this, he that calls and he that answers…” (Malachi 2:11-12). He shall not have a caller among the wise nor a responder among the students. Note: This sin has a deficit which is not present among all the other sexual proscriptions, for the son derived from a (Canaanite) female slave or from a Kuthite (non-Jewish) female is not considered his son, as opposed to descendents from other sexually proscribed women (Tur in the name of Rambam). One who has sexual relations with an idol worshiper in public, whose law is that zealots kill him, as will be explained Choshen Mishpat chapter 425, is included in the classification of sexual proscriptions, and the law is that he should permit himself to be killed rather than transgress (Beit Yosef in the name of Orchot Chaim in the name of Rambam) as is the case with other sexual proscriptions and as explained in Yoreh Deah chapter 157.