The narrative for day four begins with a simple past verb, God said. However the verb tense is an accommodation to our human understanding. God’s statement should be understood as one of His eternal decrees, not necessarily said at a specific time. Making the light bearers and setting them in the sky involved a three-day process. The narrative for day four is therefore a summary of the story of the Sun, Moon, and stars. Their story is not covered in the narrative of the first three days, which describes only the formation of the Earth.