And when Saul went forth with the soldiers, he said, "Indeed, Allāh will be testing you with a river. So whoever drinks from it is not of me, and whoever does not taste it is indeed of me, excepting one who takes [from it] in the hollow of his hand." But they drank from it, except a [very] few of them. Then when he had crossed it along with those who believed with him, they said, "There is no power for us today against Goliath and his soldiers." But those who were certain that they would meet Allāh said, "How many a small company has overcome a large company by permission of Allāh. And Allāh is with the patient."
When Saul set out with his warriors, he said to them, ‘Allah will test you with a river. If anyone drinks from it, he will not be on my path and must not join me in fighting. The person who does not drink from it will be on my path and will join me in the fight. If someone drinks a handful of water, this will be forgiven’. When they reached the river, all the warriors drank from its water, except a few of them who held back despite being extremely thirsty. After Saul had crossed the river with the believers, some of the warriors said, ‘We do not have the ability to fight Goliath and his army’. Those that were convinced that they would meet Allah on the Day of Resurrection said to them, ‘So many believing groups small in number have defeated a disbelieving group large in number with Allah’s permission and assistance. Victory is based on faith and not numbers. Allah is with the patient ones among His servants: He assists and gives them victory’.