Although it's cut from syndication, this conversation appears right at the beginning of the episode.
Kramer: We're like Cain and Abel.
Jerry: You know Cain slew Abel.
Kramer: No he didn't. They were in business together...drywall or something.
Jerry: The way I remember it, Abel worked all summer harvesting his crops, while Cain just played in the field. Then when winter came, Abel had all the nuts. Cain had no nuts. So he killed him.
Kramer: See, the way I remember it, Cain - he was a successful doctor, but when he took this special formula, he became Mr Abel.
Jerry: You broke my blender, didn't you?
Kramer: Yeah, I was trying to make gravel, and it just, didn't work out.