Surah Al-Anfal (The Spoils of War), Verse 65

یٰۤاَیُّهَا النَّبِیُّ حَرِّضِ الْمُؤْمِنِیْنَ عَلَی الْقِتَالِ اِنْ یَّكُنْ مِّنْكُمْ عِشْرُوْنَ صٰبِرُوْنَ یَغْلِبُوْا مِائَتَیْنِ وَاِنْ یَّكُنْ مِّنْكُمْ مِّائَةٌ یَّغْلِبُوْۤا اَلْفًا مِّنَ الَّذِیْنَ كَفَرُوْا بِاَنَّهُمْ قَوْمٌ لَّا یَفْقَهُوْنَ ۟

Yaaa aiyuhan Nabiyyu harridil mu'mineena 'alal qitaal; iny-yakum minkum 'ishroona saabiroona yaghliboo mi'atayn; wa iny-yakum minkum mi'atuny yaghlibooo alfam minal lazeena kafaroo bi anahum qawmul laa yafqahoon

“O Prophet! rouse the Believers to the fight. If there are twenty amongst you, patient and persevering, they will vanquish two hundred: if a hundred, they will vanquish a thousand of the Unbelievers: for these are a people without understanding.”

Quran 8:65 (Yusuf Ali Translation)