17:8Perhaps your Lord will have mercy on you. But if you revert, We will revert. We have made Hell a prison for the disbelievers.

17:51Or some substance, which, in your minds, is even harder.” Then they will say, “Who will restore us?” Say, “The One who originated you the first time.” Then they will nod their heads at you, and say, “When will it be?” Say, “Perhaps it will be soon.”

17:79And keep vigil with it during parts of the night, as an extra prayer. Perhaps your Lord will raise you to a laudable position.