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

When Talut set forth with the armies, he said: "Allah will test you at the stream: if any drinks of its water, He goes not with my army: Only those who taste not of it go with me: A mere sip out of the hand is excused." but they all drank of it, except a few. When they crossed the river,- He and the faithful ones with him,- they said: "This day We cannot cope with Goliath and his forces." but those who were convinced that they must meet Allah, said: "How oft, by Allah's will, Hath a small force vanquished a big one? Allah is with those who steadfastly persevere."