Surah Al-Anfal (The Spoils of War), Verse 43

اِذْ یُرِیْكَهُمُ اللّٰهُ فِیْ مَنَامِكَ قَلِیْلًا وَلَوْ اَرٰىكَهُمْ كَثِیْرًا لَّفَشِلْتُمْ وَلَتَنَازَعْتُمْ فِی الْاَمْرِ وَلٰكِنَّ اللّٰهَ سَلَّمَ اِنَّهٗ عَلِیْمٌۢ بِذَاتِ الصُّدُوْرِ ۟

Iz yureekahumul laahu fee manaamika qaleela; wa law araakahum kaseeral lafashiltum wa latanaaza'tum fil amri wa laakinnal laaha sallam; innahoo 'aleemum bizaatis sudoor

“Remember in thy dream Allah showed them to thee as few: if He had shown them to thee as many, ye would surely have been discouraged, and ye would surely have disputed in (your) decision; but Allah saved (you): for He knoweth well the (secrets) of (all) hearts.”

Quran 8:43 (Yusuf Ali Translation)