Surah Al-Anfal (The Spoils of War), Verse 45

یٰۤاَیُّهَا الَّذِیْنَ اٰمَنُوْۤا اِذَا لَقِیْتُمْ فِئَةً فَاثْبُتُوْا وَاذْكُرُوا اللّٰهَ كَثِیْرًا لَّعَلَّكُمْ تُفْلِحُوْنَ ۟

Yaaa aiyuhal lazeena aamanooo izaa laqeetum fi'atan fasbutoo wazkurul laaha kaseeral la'allakum tuflihoon

“O ye who believe! When ye meet a force, be firm, and call Allah in remembrance much (and often); that ye may prosper:”

Quran 8:45 (Yusuf Ali Translation)