the Promised Savior in Quran

وَ لَئِنْ أَخَّرْنا عَنْهُمُ الْعَذابَ إِلى‏ أُمَّةٍ مَعْدُودَةٍ لَیَقُولُنَّ ما یَحْبِسُهُ أَلا یَوْمَ یَأْتِیهِمْ لَیْسَ مَصْرُوفاً عَنْهُمْ وَ حاقَ بِهِمْ ما كانُوا بِهِ یَسْتَهْزِؤُنَ

And if We defer their punishment until a certain time, they will surely say, ‘What holds it back?’ Look! On the day it overtakes them it shall not be turned away from them, and they will be besieged by what they used to deride.