The Genesis flood narrative (chapters 6–9 of the Book of Genesis) is a Hebrew flood myth. It tells of God's decision to return the universe to its pre-creation state of watery chaos and remake it through the microcosm of Noah's Ark.
The Book of Genesis was probably composed around the 5th century BCE; although some scholars believe that primeval history (chapters 1–11), including the flood narrative, may have been composed and added as late as the 3rd century BCE. It draws on two sources, called the Priestly source and the non-Priestly or Yahwist, and although many of its details are contradictory, the story forms a unified whole.