Genesis 1:14-15

Then God said, “Let there be light-bearers (sun, moon, stars) in the expanse of the heavens to separate the day from the night, and let them be useful for signs (tokens) [of God’s provident care], and for marking seasons, days, and years; [Gen 8:22] and let them be useful as lights in the expanse of the heavens to provide light on the earth”; and it was so, [just as He commanded].