Surah Al-Anfaal, Verse 43
إِذْ يُرِيكَهُمُ ٱللَّهُ فِى مَنَامِكَ قَلِيلًۭا ۖ وَلَوْ أَرَىٰكَهُمْ كَثِيرًۭا لَّفَشِلْتُمْ وَلَتَنَٰزَعْتُمْ فِى ٱلْأَمْرِ وَلَٰكِنَّ ٱللَّهَ سَلَّمَ ۗ إِنَّهُۥ عَلِيمٌۢ بِذَاتِ ٱلصُّدُورِ
Translation — Sahih International
[Remember, O Muhammad], when Allah 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 Allah saved [you from that]. Indeed, He is Knowing of that within the breasts.
Source
Kur'an-ı Kerim, Enfâl Suresi 8:43
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/8-suresi-43-ayet