Surah Al-Anfal, ayah 66

8:66

ٱلۡـَٰٔنَ خَفَّفَ ٱللَّهُ عَنكُمۡ وَعَلِمَ أَنَّ فِيكُمۡ ضَعۡفٗاۚ فَإِن يَكُن مِّنكُم مِّاْئَةٞ صَابِرَةٞ يَغۡلِبُواْ مِاْئَتَيۡنِۚ وَإِن يَكُن مِّنكُمۡ أَلۡفٞ يَغۡلِبُوٓاْ أَلۡفَيۡنِ بِإِذۡنِ ٱللَّهِۗ وَٱللَّهُ مَعَ ٱلصَّٰبِرِينَ ٦٦

Al-'ana khaffafallāhu 'ankum wa'alima anna fīkum da'fan fa in yakum minkum mi'atun sābiratun yaghlibū mi'atayni wa in yakum minkum alfun yaghlibū alfayni bi idhnillāhi wallāhu ma'as-sābirīn

Now, Allāh has lightened [the hardship] for you, and He knows that among you is weakness. So if there are from you one hundred [who are] steadfast, they will overcome two hundred. And if there are among you a thousand, they will overcome two thousand by permission of Allāh. And Allāh is with the steadfast.