Ali 'Imran 3:13

قَدۡ كَانَ لَكُمۡ ءَايَةٞ فِي فِئَتَيۡنِ ٱلۡتَقَتَاۖ فِئَةٞ تُقَٰتِلُ فِي سَبِيلِ ٱللَّهِ وَأُخۡرَىٰ كَافِرَةٞ يَرَوۡنَهُم مِّثۡلَيۡهِمۡ رَأۡيَ ٱلۡعَيۡنِۚ وَٱللَّهُ يُؤَيِّدُ بِنَصۡرِهِۦ مَن يَشَآءُۚ إِنَّ فِي ذَٰلِكَ لَعِبۡرَةٗ لِّأُوْلِي ٱلۡأَبۡصَٰرِ 13

Already there has been for you a sign in the two armies which met - one fighting in the cause of Allah and another of disbelievers. They saw them [to be] twice their [own] number by [their] eyesight. But Allah supports with His victory whom He wills. Indeed in that is a lesson for those of vision