Al-Baqarah 2:249 فلما فصل طالوت بالجنود قال ان الله مبتليكم بنهر فمن شرب منه فليس مني ومن لم يطعمه فانه مني الا من اغترف غرفة بيده فشربوا منه الا قليلا منهم فلما جاوزه هو والذين امنوا معه قالوا لا طاقة لنا اليوم بجالوت وجنوده قال الذين يظنون انهم ملاقو الله كم من فية قليلة غلبت فية كثيرة باذن الله والله مع الصابرين ٢٤٩

And 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.