Amazing how everytime allah speaks in the quran he says "We", not "I" or "I, Allah".
The entire quran says we. I even checked the arabic in this version.
Associating anything with allah in Islam is shirk, yet allah associates everything with himself, even swearing by everything that is seen and unseen. And obviously if allah says "We" all through the quran it means he is associating someone with himself.
Very basic example, one of many.
Who is with allah? Its even a capital W. And if its not allah alone then who sent down the book, "we" means more than one.
Who is we?. Allah and who?
Quran 16:89
And We will bring you, [O Muhammad], as a witness over your nation. And We have sent down to you the Book as clarification for all things and as guidance and mercy and good tidings for the Muslims.