In Genesis 3:15 we see the first declaration of Yahweh's plan for redemption. We learn of two seeds, one of the serpent and the other of the woman. From the woman will come a Redeemer to crush the serpent's head. Only one chapter later, we see the story of the serpent's seed begin to unfold when Cain kills his own brother. Genesis 5 follows two genealogies, one associated with evil while the other will bring about the Promised Seed to crush the serpent's head. 

References: 

Genesis 3:15

The Debate Between Summer & Winter

Genesis 4

Anchor Yale Bible Dictionary

Numbers 24:21

Joshua 15:57

Judges 1:6

Judges 5: 24 

Numbers 13:33 

Dictionary of Deities and Demons - Rabisu 

Faithlife Study Bible

Job 16:18

Numbers 35:33

Deuteronomy 21

Strangely Biblical - Episode 9 - Genesis 2, Eden & Mankind

Genesis 9:6 

Genesis 5

Music in this episode: 

Jo Wandrini - Odyssey of the Lost - Courtesy of www.epidemicsound.com

Christoffer Moen Ditlevsen - Abyss  - Courtesy of www.epidemicsound.com

David Celeste - Go On, Be Gone  - Courtesy of www.epidemicsound.com

David Celeste - Sphinx - Courtesy of www.epidemicsound.com

Hanna Lindgreen - Sending - Courtesy of www.epidemicsound.com

Ruiqi Zhao - The Mysterious Cave - Courtesy of www.epidemicsound.com

Gabriel Lewis - Oh the Humanity - Courtesy of www.epidemicsound.com

Dream Cave - You Saved Me  - Courtesy of www.epidemicsound.com

Bitwraith - My Friend, The Warlock - Courtesy of www.epidemicsound.com