The serpent was more subtil than any beast of the field -- Genesis 3:1
In Christian Identity theology, the serpent is a black male ("beast of the field"), possessed by the devil, who seduced Eve. Cain is the child that is born from this union, the evil son of the devil and the first Jew. All Jews are descended from Cain.
"If a man lie with a beast"
"The beast of the field"
The mark of Cain