Original: In Sotah 10b , Samael is Esau 's guardian angel , and in the Sayings of Rabbi Eliezer , he is charged with being the one who tempted Eve , then seduced and impregnated her with Cain .
Simplified: In the Sayings of Rabbi Eliezer , he is said to be the one who tempted Eve , then seduced and impregnated her with Cain .