Surah Al-Anfal, ayah 45

يَٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓاْ إِذَا لَقِيتُمۡ فِئَةٗ فَٱثۡبُتُواْ وَٱذۡكُرُواْ ٱللَّهَ كَثِيرٗا لَّعَلَّكُمۡ تُفۡلِحُونَ ٤٥

Yā'ayyuhal-ladhīna āmanū idhā laqītum fi atan fathbutū wadhkurullāha kathīral la'allakum tuflihūn

O you who have believed, when you encounter a company [from the enemy forces], stand firm and remember Allāh much that you may be successful.