Quran 2, Al-Baqara (The Cow) ⓘ

2:249And when Saul set out with the army, he said: Lo! Allah will try you by (the ordeal of) a river. Whosoever therefore drinketh thereof he is not of me, and whosoever tasteth it not he is of me, save him who taketh (thereof) in the hollow of his hand. But they drank thereof, all save a few of them. And after he had crossed (the river), he and those who believed with him, they said: We have no power this day against Goliath and his hosts. But those who knew that they would meet Allah exclaimed: How many a little company hath overcome a mighty host by Allah's leave! Allah is with the steadfast.

فَلَمَّا فَصَلَ طَالُوتُ بِالْجُنُودِ قَالَ إِنَّ اللَّهَ مُبْتَلِيكُمْ بِنَهَرٍ فَمَنْ شَرِبَ مِنْهُ فَلَيْسَ مِنِّي وَمَنْ لَمْ يَطْعَمْهُ فَإِنَّهُ مِنِّي إِلَّا مَنِ اغْتَرَفَ غُرْفَةً بِيَدِهِ فَشَرِبُوا مِنْهُ إِلَّا قَلِيلًا مِنْهُمْ فَلَمَّا جَاوَزَهُ هُوَ وَالَّذِينَ آمَنُوا مَعَهُ قَالُوا لَا طَاقَةَ لَنَا الْيَوْمَ بِجَالُوتَ وَجُنُودِهِ قَالَ الَّذِينَ يَظُنُّونَ أَنَّهُمْ مُلَاقُو اللَّهِ كَمْ مِنْ فِئَةٍ قَلِيلَةٍ غَلَبَتْ فِئَةً كَثِيرَةً بِإِذْنِ اللَّهِ وَاللَّهُ مَعَ الصَّابِرِينَ