When they were in the cave, when he was saying to his companion “Do not grieve; indeed [Almighty] Allaah is with us”; then Allaah [Ta’aalaa] caused His calm to descend upon him and helped him with armies you did not see, and disgraced the word of the disbelievers; and  [Almighty]Allaah’s Word is supreme; and Allaah is the Almighty, the Wise-Soorah Taubaah-Verse-40

إِلَّا تَنْصُرُوهُ فَقَدْ نَصَرَهُ اللَّهُ إِذْ أَخْرَجَهُ الَّذِينَ كَفَرُوا ثَانِيَ اثْنَيْنِ إِذْ هُمَا فِي الْغَارِ إِذْ يَقُولُ لِصَاحِبِهِ لَا تَحْزَنْ إِنَّ اللَّهَ مَعَنَا ۖ فَأَنْزَلَ اللَّهُ سَكِينَتَهُ عَلَيْهِ وَأَيَّدَهُ بِجُنُودٍ لَمْ تَرَوْهَا وَجَعَلَ كَلِمَةَ الَّذِينَ كَفَرُوا السُّفْلَىٰ ۗ وَكَلِمَةُ اللَّهِ هِيَ الْعُلْيَا ۗ وَاللَّهُ عَزِيزٌ حَكِيمٌ‎