And He—the Exalted—said:

“The Hour has drawn near and the moon has split. Yet whenever they behold a sign, they turn away and say, ‘Persistent sorcery.’” ⦗al-Qamar: 1⦘

He also said:

“Among them are those who listen to you, but We have placed coverings upon their hearts so that they do not comprehend it, and a heaviness in their ears. Even if they were to see every sign, they would still not believe in it. When they come to you disputing, the disbelievers say, ‘This is nothing but the legends of the former peoples.’” ⦗al-Anʿām: 25⦘

And He—glorified be He—said:

“They say, ‘Why have no signs been sent down to him from his Lord?’ Say, ‘The signs rest with Allah alone, and I am only a clear warner.’ Is it not enough for them that We have sent down to you the Book, which is recited to them? Surely in that there is mercy and a reminder for a people who believe.” ⦗al-ʿAnkabūt: 50⦘

And He said:

“We shall show them Our signs on the horizons and within themselves until it becomes clear to them that it is the Truth.” ⦗Fussilat: 53⦘