﴿ يَٰٓأَيُّهَا ٱلنَّبِىُّ حَرِّضِ ٱلْمُؤْمِنِينَ عَلَى ٱلْقِتَالِ ۚ إِن يَكُن مِّنكُمْ عِشْرُونَ صَٰبِرُونَ يَغْلِبُوا۟ مِا۟ئَتَيْنِ ۚ وَإِن يَكُن مِّنكُم مِّا۟ئَةٌۭ يَغْلِبُوٓا۟ أَلْفًۭا مِّنَ ٱلَّذِينَ كَفَرُوا۟ بِأَنَّهُمْ قَوْمٌۭ لَّا يَفْقَهُونَ ﴾

“O Prophet! Inspire the believers to conquer all fear of death when fighting, [so that,] if there be twenty of you who are patient in adversity, they might overcome two hundred; and [that,] if there be one hundred of you, they might overcome one thousand of those who are bent on denying the truth, because they are people who cannot grasp it.”

Please check ayah 8:66 for complete tafsir.