the whole realm above the earth: the sky you can see and, beyond it, the place where God dwells
Hebrew has one word for everything overhead, and it stretches a long way. It covers the open air where birds fly and clouds gather, the height where the sun, moon and stars are set, and the dwelling place of God above all of it. The same word carries the rain falling on a field and the throne of God, because for the biblical writers these are not separate compartments but one upward realm that climbs out of human reach into God's own space. The expanse God spreads out and then names "heaven" in Genesis 1:8 (רָקִיעַ) is the same thing the psalms look up at and the prophets watch go dark.
The word is always plural in form, the way English says "waters", and Hebrew has no singular for it. That plural is not a tally of stacked heavens. The ancient Greek translators regularly rendered it with a single word for heaven (οὐρανός), and the Bible's own "heaven of heavens" works as a superlative, the utmost reach, rather than a count.
Joined with "earth" the word does something different: naming the two far ends of things is a Hebrew way of meaning everything in between, so "heaven and earth" is the whole universe. That pairing opens the Bible in Genesis 1:1 and runs through it as shorthand for all that exists. It also gives Hebrew its word for what we would call mid air, since a thing suspended off the ground hangs "between heaven and earth".
Around these central uses cluster a set of everyday turns of phrase, and they are worth knowing because English Bibles translate them literally:
- "the host of heaven" can mean the stars themselves or the heavenly beings around God, and worshiping it is condemned as idolatry
- "under heaven" simply means anywhere on earth, the whole inhabited world
- something "as high as heaven" is out of reach, and the "end of heaven" is the farthest place there is
- "as the days of heaven" means for as long as the world lasts
- when God brings a case against his people, heaven and earth are summoned to listen as witnesses
Nuances
Whether the expanse that Genesis 1:8 names "heaven" was conceived as a solid vault holding back waters above the earth, or as open sky.
- contestedThe text reflects an ancient picture of a solid, hammered out dome over the earth, beneath which the sun, moon and stars move and above which water is held back.; Paul H. Seely, "The Firmament and the Water Above, Part I: The Meaning of raqiaʿ in Gen 1:6-8," Westminster Theological Journal 53 (1991): 227-240; Paul H. Seely, "The Firmament and the Water Above, Part II," Westminster Theological Journal 54 (1992); John H. Walton, Genesis 1 as Ancient Cosmology, Winona Lake: Eisenbrauns, 2011
- contestedThe solid dome is a modern reconstruction rather than a biblical claim; the word for the expanse need not denote a hard vault, and the comparative Mesopotamian evidence is itself contested.; Randall W. Younker and Richard M. Davidson, "The Myth of the Solid Heavenly Dome: Another Look at the Hebrew raqiaʿ," Andrews University Seminary Studies 49 (2011): 125-147; Noel K. Weeks, "Cosmology in Historical Context," Westminster Theological Journal 68 (2006): 283-293
- contestedThe language is genuinely ancient and describes the sky as it appears, without committing the text to any fixed physical model of the heavens.; Kyle Greenwood, Scripture and Cosmology: Reading the Bible Between the Ancient World and Modern Science, Downers Grove: IVP Academic, 2015; C. John Collins, Genesis 1-4: A Linguistic, Literary, and Theological Commentary, Phillipsburg: P&R, 2006