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

Then when Tâlût (Saul) set out with the army, he said: "Verily! Allâh will try you by a river. So whoever drinks thereof, he is not of me, and whoever tastes it not, he is of me, except him who takes (thereof) in the hollow of his hand." Yet, they drank thereof, all, except a few of them. So when he had crossed it (the river), he and those who believed with him, they said: "We have no power this day against Jâlût (Goliath) and his hosts." But those who knew with certainty that they were going to meet Allâh, said: "How often a small group overcame a mighty host by Allâh’s Leave?" And Allâh is with As-Sâbirûn (the patient).