The Bee - 16:52
To Him belongs whatever is in the heavens and whatever is in the earth. And the religion is His alone at all times. Do you fear anyone other than Allah?
Those who died counting others besides Allah?
The Women/4:48
Allah does not forgive associating partners with Him, but other than that He forgives to whom He wills. Whoever associates partners with Allah has committed a great insult.
The Women/4:116
Allah does not forgive associating partners with Him (if it continues until death), but He forgives the sins below that to whom He wills. Whoever associates partners with Allah has gone astray.