Prophet Hud - 11:28
"He said: "O my people, what if I have a clear proof from my Lord and He has given me Mercy and it is not visible to your eyes? Shall we force you to it while you do not want it?"
The only valid evidence; revelation-book:
The Cattle/6:148
"Those who associate partners will say: "If Allah had not willed, neither we nor our fathers would have associated partners, nor would we have forbidden anything."And those before them denied in the same way until they tasted Our torment. Say: "Do you have any knowledge with you that you can show us? You follow only conjecture (doubtful and contradictory narrations) and you are only guessing."
Originator/35:40
"Say, "Have you considered your partners whom you call besides Allah; show me what they have created in the earth?"Or do they have a partnership in the sky? Or have We given them a Book and they rely on a proof in it? Indeed, the wrong-doers give only deceitful promises to one another."
Those Who Set The Ranks/37:152
"Allah gave birth."They are liars."
Those Who Set The Ranks/37:156
Or do you have a clear proof?
Those Who Set The Ranks/37:157
Bring your Book if you are truthful.
The Star/53:19
Have you seen Lat and Uzza (your female idols)?
The Star/53:20
And Menat, the third of them?
The Star/53:23
They are nothing but names that you and your fathers called them, and Allah has not sent down for them any proof. They follow only their delusions and personal desires, while a guidance has come to them from their Lord.
The Cattle/6:157
"Nor can you say, "If the Book had been sent down to us, we would have been on a more right path than them". There has come to you a proof from your Lord, a guidance and a mercy. Who is more unjust than he who denies the signs of Allah and turns away from them? We will punish those who turn away from Our Verses with the worst of torment for their turning away."
The Women/4:174
People! A proof has come to you from your Lord and We have sent down upon you a clear light.
The Kneeling/45:20
These are enlightening proofs for the people, a guide and mercy for a people who have firm faith.