Read Ruku 151 of the Quran

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓا۟ إِذَا لَقِيتُمْ فِئَةًۭ فَٱثْبُتُوا۟ وَٱذْكُرُوا۟ ٱللَّهَ كَثِيرًۭا لَّعَلَّكُمْ تُفْلِحُونَ ﴿٤٥﴾

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

وَأَطِيعُوا۟ ٱللَّهَ وَرَسُولَهُۥ وَلَا تَنَـٰزَعُوا۟ فَتَفْشَلُوا۟ وَتَذْهَبَ رِيحُكُمْ ۖ وَٱصْبِرُوٓا۟ ۚ إِنَّ ٱللَّهَ مَعَ ٱلصَّـٰبِرِينَ ﴿٤٦﴾

And obey Allah and His Messenger, and do not dispute and [thus] lose courage and [then] your strength would depart; and be patient. Indeed, Allah is with the patient.

وَلَا تَكُونُوا۟ كَٱلَّذِينَ خَرَجُوا۟ مِن دِيَـٰرِهِم بَطَرًۭا وَرِئَآءَ ٱلنَّاسِ وَيَصُدُّونَ عَن سَبِيلِ ٱللَّهِ ۚ وَٱللَّهُ بِمَا يَعْمَلُونَ مُحِيطٌۭ ﴿٤٧﴾

And do not be like those who came forth from their homes insolently and to be seen by people and avert [them] from the way of Allah. And Allah is encompassing of what they do.

وَإِذْ زَيَّنَ لَهُمُ ٱلشَّيْطَـٰنُ أَعْمَـٰلَهُمْ وَقَالَ لَا غَالِبَ لَكُمُ ٱلْيَوْمَ مِنَ ٱلنَّاسِ وَإِنِّى جَارٌۭ لَّكُمْ ۖ فَلَمَّا تَرَآءَتِ ٱلْفِئَتَانِ نَكَصَ عَلَىٰ عَقِبَيْهِ وَقَالَ إِنِّى بَرِىٓءٌۭ مِّنكُمْ إِنِّىٓ أَرَىٰ مَا لَا تَرَوْنَ إِنِّىٓ أَخَافُ ٱللَّهَ ۚ وَٱللَّهُ شَدِيدُ ٱلْعِقَابِ ﴿٤٨﴾

And [remember] when Satan made their deeds pleasing to them and said, "No one can overcome you today from among the people, and indeed, I am your protector." But when the two armies sighted each other, he turned on his heels and said, "Indeed, I am disassociated from you. Indeed, I see what you do not see; indeed I fear Allah. And Allah is severe in penalty."