“Stretching back to Cain and Abel. It's in your blood, your father's blood, your family's blood.” ---Michael, “The Song Remains the Same”
Supernatural has explicitly laced Biblical lore through its mythology since season four---and season nine has shaped itself around that of Genesis. The Garden of Eden and the Fall of Man was a focal point for the story surrounding the fall of the angels, Castiel's stint as a human, and the serpents let into the various Gardens such as Gadreel's possession of Sam and intrusion into the MOL Bunker. As we transition into the back half of the season, we're watching the story unfold around the aftermath of the serpent's infection. In “First Born,” we are given yet another Biblical story---also from Genesis and after the Fall of Man---for the show to use as framework: that of Cain and Abel and the First Murder.
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