﴿ يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِذَا لَقِيتُمْ فِئَةًۭ فَٱثْبُتُوا۟ وَٱذْكُرُوا۟ ٱللَّهَ كَثِيرًۭا لَّعَلَّكُمْ تُفْلِحُونَ ﴾

“[Hence,] O you who have attained to faith, when you meet a host in battle, be firm, and remember God often; so that you might attain to a happy state!”

(O ye who believe!) He means the Companions of Muhammad (pbuh) (When you meet an army) a group of the disbelievers on the Day of Badr, (hold firm) along with your prophet in war (and think of Allah much) in your hearts and with your tongues, saying: �there is no deity except Allah�, and �Allah is the greatest�, (that ye may be successful) that you may be safe from Allah's wrath and punishment and be assisted.