Quran 11:7~8

It is He who created the heavens and the earth in six days—and His Throne was upon the waters—in order to test you—which of you is best in conduct. And if you were to say, “You will be resurrected after death,” those who disbelieve would say, “This is nothing but plain witchcraft.”
And if We postponed their punishment until a stated time, they would say, “What holds it back?” On the Day when it reaches them, it will not be averted from them, and what they used to ridicule will besiege them.