King James Bible
"And God set them in the firmament of the heaven to give light upon the earth,"
God actively places the luminaries (sun, moon, and stars from v.16) in the expanse He created on day two. The Hebrew verb 'set' implies deliberate positioning, emphasizing God's sovereign arrangement of the cosmos rather than random celestial placement. This states the primary purpose of these heavenly bodies—to illuminate the earth for its inhabitants. The focus shifts from cosmic creation to earth-centered function, showing God's care in providing for the world He is preparing for life.