Quran 7:171 — The Purgatory (Al-A'araf)

We raised the mountain above them like an umbrella, and they thought it was going to fall on them: "You shall uphold what we have given you, strongly, and remember the contents thereof, that you may be saved."

[7:170] Those who uphold the scripture, and observe the Contact Prayers (Salat), we never fail to recompense the pious.

[7:172] Recall that your Lord summoned all the descendants of Adam, and had them bear witness for themselves: "Am I not your Lord?" They all said, "Yes. We bear witness." Thus, you cannot say on the Day of Resurrection, "We were not aware of this."