Genesis 1:15

And let them be for lights in the firmament of the heaven ,.... To continue there as luminous bodies; as enlighteners, as the word signifies, causing light, or as being the instruments of conveying it, particularly to the earth, as follows:

to give light upon the earth ; and the inhabitants of it, when formed:

and it was so : these lights were formed and placed in the firmament of the heaven for such uses, and served such purposes as God willed and ordered they should.