Then when Saul set out with the army, he said: “Surely Allah will try you with a river; whoever then drinks from it, he is not of me, and whoever does not taste of it, he is surely of me, except he who takes (of it) in the hollow of his hand”. Yet, they drank of it, all, except a few of them. So when he crossed it together with those who believed with him, they said: “We have today no power against Jâlût (Goliath) and his army”. Those who were sure that they would meet their Lord said: “How often has a small party vanquished a bigger party by Allah’s Leave”. And Allah is with the patient.
So they routed them by Allah’s Leave and David (Dâvûd) killed Goliath and Allah gave him (David) the kingdom (after the death of Saul) and the Wisdom, and taught him of that which He willed. And were it not for Allah’s repelling some men with others, the earth would indeed be full of mischief but Allah is full of Virtues upon the worlds.