The Companies - 39:29
Allah gives the example of a man who has disputing partners and a man who depends on a single person. Are these two ever equal? Praise is to Allah. But many do not know.
If there were other gods besides Allah, they would quarrel with one another:
The Prophets/21:22
Had there been gods other than Allah in those two (the heavens and the earth), both would have fallen into chaos. Allah, the Owner of absolute authority, is far from their characterizations.
The Believers/23:91
Allah has not begotten a child, nor is there a god with Him. Otherwise, every god would have declared his independence with his creations and would have competed with each other for power. Allah is far away from what they describe.
Luqman/31:30
For Allah is the Truth, and what they call besides Him is falsehood, and Allah is the Most High and the Greatest.