The Forgiver - 40:12 Because when Allah ALONE was called, you disbelieved. You used to believe only when partners were associated with Him. The judgment belongs to Allah, the Exalted and the Great.
The disbelief of those who are called to serve Allah alone:
The Heights/7:59 "We sent Noah to his people: "O my people, worship Allah. You have no god besides Him. I fear for you the torment of a great day."
The Heights/7:60 "The elders of his people said: "We see you in manifest error"."
The Heights/7:70 "They said: "Have you come to us that we may serve Allah alone and abandon what our forefathers served? Bring us what you threatened us with if you are truthful."

Prophet Jonah/10:78 "They said: "Have you come to us to turn us away from that on which we found our fathers, so that greatness in the earth may remain for the two of you? We will never believe in you."

Prophet Hud/11:53 "They said: "O Hud, you have not come to us with a clear proof. We will not abandon our religion on your word alone, nor will we believe in you."
Prophet Hud/11:54 "He said: "We say that you have been struck by one of our gods": "I bear Allah as a witness, and you bear witness that I am far from that which you associate as partners."
Prophet Hud/11:62 "They said: "O Salih, before this you were a popular source of hope among us. Do you now forbid us from what our forefathers used to serve? We are in doubt about what you call us to."

Prophet Abraham/14:9 "Has not reached you the news of those who were before you, of Noah and the people of Aad and Thamud and those who came after them, whom only Allah knows? Their messengers went to them with clear proofs, but they despised them and said: "We disbelieve in what you have brought and we have doubts and misgivings about the message to which you call us"."
Prophet Abraham/14:10 "Their messengers said: "Do you doubt Allah, Who created the heavens and the earth, and He calls you to forgive you your sins and gives you a certain period of time?"They said: "You are but men like us, and you want to turn us away from that which our forefathers used to serve. Bring us a clear authorization"."

The Criterion/25:41 "Whenever they see you, they ridicule you: "Is this the one whom Allah has sent as a messenger?"
The Criterion/25:42 "Had we not resisted, he would almost have led us astray from our gods."When they see the torment, they will know who is truly astray."

Those Who Set The Ranks/37:35 "When it was said to them: "La ilaaha illa Allah", they were arrogant."
Those Who Set The Ranks/37:36 "They used to say: "Shall we abandon our gods for a mad poet?"

The Arabic Letter Sad/38:5 He made the gods one god? This is very strange indeed!
The Arabic Letter Sad/38:6 "Their leaders rushed forward and said, "Go on, stick to your gods. This is all that is required of you."
The Arabic Letter Sad/38:7 We have not heard anything like this in the last religion; it is a fabrication.
The Arabic Letter Sad/38:8 "Why was the Message revealed to him from among us?"Indeed, they are in doubt about My Message. No, they have not yet tasted the torment."

The Forgiver/40:84 "When they finally see Our punishment, they say: "We have believed in Allah ONLY, and we have disbelieved in that which we associate with partners"."

The Ornaments of Gold/43:57 When the son of Mary was shown as an example, your people immediately rejected.
The Ornaments of Gold/43:58 "They said: "Are our gods better or is he?"They said this only to argue with you. They are indeed a quarrelsome people."

The Sandhills/46:21 "Remember when Ad´s brother warned his people in the sand dunes. Before and after that he said: "Do not serve none but Allah. I fear for you the torment of a great day"."
The Sandhills/46:22 "Have you come to us to lead us astray from our gods? Bring us what you have promised us if you are truthful"."

Prophet Noah/71:21 "Noah said, "My Lord, they have disobeyed me and followed a man whose money and children only harm him."
Prophet Noah/71:23 They said, ´Do not abandon your gods. Do not leave Vedd, nor Suva, nor Yegus, nor Yeuk, nor Nesr.
Prophet Noah/71:24 They have led many astray. So increase the confusion of the wrongdoers.