Surah Al-Anfal, Verse 43

إِذۡ يُرِيكَهُمُ ٱللَّهُ فِي مَنَامِكَ قَلِيلٗاۖ وَلَوۡ أَرَىٰكَهُمۡ كَثِيرٗا لَّفَشِلۡتُمۡ وَلَتَنَٰزَعۡتُمۡ فِي ٱلۡأَمۡرِ وَلَٰكِنَّ ٱللَّهَ سَلَّمَۚ إِنَّهُۥ عَلِيمُۢ بِذَاتِ ٱلصُّدُورِ٤٣

idh yurīkahumu l-lahu fī manāmika qalīlan walaw arākahum kathīran lafashil'tum walatanāzaʿtum fī l-amri walākinna l-laha sallama innahu ʿalīmun bidhāti l-ṣudūri

[Remember, O Muḥammad], when Allāh showed them to you in your dream as few; and if He had shown them to you as many, you [believers] would have lost courage and would have disputed in the matter [of whether to fight], but Allāh saved [you from that]. Indeed, He is Knowing of that within the breasts.