Quran 7:52 — The Purgatory (Al-A'araf)

We have given them a scripture that is fully detailed, with knowledge, guidance, and mercy for the people who believe.

[7:51] Those who do not take their religion seriously, and are totally preoccupied with this worldly life, we forget them on that day, because they forgot that day, and because they spurned our revelations.

[7:53] Are they waiting until all (prophecies) are fulfilled? The day such fulfillment comes to pass, those who disregarded it in the past will say, "The messengers of our Lord have brought the truth. Are there any intercessors to intercede on our behalf? Would you send us back, so that we change our behavior, and do better works than what we did?" They have lost their souls, and their own innovations have caused their doom.