Her seed זַרְעָהּ
A promise spoken inside a curse
The first promise in the Bible is not spoken to the man or the woman. It is spoken at the serpent, as a sentence. There will be war between your seed and her seed, and her seed will crush your head. The rest of Scripture is the story of that promise finding its feet.

An old gardener sets a seedling into a child’s cupped hands. The promise outlives the one who first received it. It travels down the line, kept by hands not yet born when it was made.
The promise travels
Eve herself reads her family through the promise: a seed, appointed. The line is already being counted.
And the serpent’s seed? John the Baptist calls covenant leaders a brood of vipers. Followed down the Bible, the two seeds look less like snakes and people and more like two allegiances. Those allegiances can run through the middle of the covenant community itself.
Paul goes further than picking a side. He narrows the whole promised line to one person. Zera, like “offspring” in English, can name a crowd or a single heir. Paul leans on the singular and says the line was always narrowing toward one man. Who belongs to that man is a different question: the faithful against the unfaithful within the line, Cain against Seth, the flesh-born against the promise-born. That question already has its own page. The study be fruitful walks it from Genesis 4 through John 8 and Romans 9. This page owns the two seeds at war with each other; that one owns which children count inside the woman’s.
Paul ends Romans with Genesis 3:15 in his hands: the bruising of the enemy, spoken over a living congregation, under your feet. The garden’s promise is handed to real people in a real room. What Paul meant by it is yours to press.
Her Seed shines opposite the exile-star in the dusk sky, the promise that walked out with them.
Open this scene’s sky →"Her seed" is Christ, born of a woman, who crushed Satan's head at the cross while Satan bruised his heel, the first gospel promise.
"Her seed" and "thy seed" are two lines of allegiance, not two species, and the Gospels find the serpent's line among the covenant's own leaders.
Genesis 3:15 names no names and sets no date. On its face it is enmity, two lines, a wounding and a crushing. Everything more comes from following where its words travel, and this page shows the path we see. The identification of the seed, and the timing of the crushing, are the two questions this site leaves in your hands.