Surah Ali'Imran, Verse 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 ٱلۡأَبۡصَٰرِ١٣

qad kāna lakum āyatun fī fi-atayni l-taqatā fi-atun tuqātilu fī sabīli l-lahi wa-ukh'rā kāfiratun yarawnahum mith'layhim raya l-ʿayni wal-lahu yu-ayyidu binaṣrihi man yashāu inna fī dhālika laʿib'ratan li-ulī l-abṣāri

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