Al-Baqarah · 2:249

249. 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’.