sun set, He said: oh! My people! I am indeed free from your (quilt) of giving partners to Allah. For me, I have set my face, firmly and truly towards him who created the heavens and the earth, and never shall I give partners to Allah.”
That is how Abraham argued with his countrymen and told them that the sun, moon, and stars may appear and disappear and therefore are not goddesses. Yet, they were in need of somebody to control them.