Quran 8:43 from Surah Al-Anfaal on Divine Marvels.
إِذۡ يُرِيكَهُمُ ٱللَّهُ فِي مَنَامِكَ قَلِيلٗاۖ وَلَوۡ أَرَىٰكَهُمۡ كَثِيرٗا لَّفَشِلۡتُمۡ وَلَتَنَٰزَعۡتُمۡ فِي ٱلۡأَمۡرِ وَلَٰكِنَّ ٱللَّهَ سَلَّمَۚ إِنَّهُۥ عَلِيمُۢ بِذَاتِ ٱلصُّدُورِ
English translation: When you (where) shown them (by) Allah in your dream (as) few and if He had shown them to you (as) many surely you would have lost courage and surely you would have disputed in the matter but Allah saved (you) Indeed, He (is) All-Knower of what is in the breasts
Transliteration: idh yurikahumu al-lahu fi manamika qalilan walaw arakahum kathiran lafashil'tum walatanaza'tum fi al-amri walakinna al-laha sallama innahu alimun bidhati al-suduri