Surah At-Taubah (The Repentance), Verse 40

اِلَّا تَنْصُرُوْهُ فَقَدْ نَصَرَهُ اللّٰهُ اِذْ اَخْرَجَهُ الَّذِیْنَ كَفَرُوْا ثَانِیَ اثْنَیْنِ اِذْ هُمَا فِی الْغَارِ اِذْ یَقُوْلُ لِصَاحِبِهٖ لَا تَحْزَنْ اِنَّ اللّٰهَ مَعَنَا فَاَنْزَلَ اللّٰهُ سَكِیْنَتَهٗ عَلَیْهِ وَاَیَّدَهٗ بِجُنُوْدٍ لَّمْ تَرَوْهَا وَجَعَلَ كَلِمَةَ الَّذِیْنَ كَفَرُوا السُّفْلٰی وَكَلِمَةُ اللّٰهِ هِیَ الْعُلْیَا وَاللّٰهُ عَزِیْزٌ حَكِیْمٌ ۟

Illaa tansuroohu faqad nasarahul laahu iz akhrajahul lazeena kafaroo saaniyasnaini iz humaa filghaari iz yaqoolu lisaahibihee laa tahzan innnal laaha ma'anaa; fa anzalallaahu sakeenatahoo 'alaihi wa aiyadahoo bijunoodil lam tarawhaa wa ja'ala kalimatal lazeena kafarus suflaa; wa Kalimatul laahi hiyal 'ulyaa; wallaahu 'Azeezun Hakeem

“If ye help not (your leader), (it is no matter): for Allah did indeed help him, when the Unbelievers drove him out: he had no more than one companion; they two were in the cave, and he said to his companion, "Have no fear, for Allah is with us": then Allah sent down His peace upon him, and strengthened him with forces which ye saw not, and humbled to the depths the word of the Unbelievers. But the word of Allah is exalted to the heights: for Allah is Exalted in might, Wise.”

Quran 9:40 (Yusuf Ali Translation)