Jdg 7:5-6
Gideon was to divide the people by putting all those who should lick the water with their tongue as a dog licketh into one class, and all those who knelt down to drink into another, and so separating the latter from the former. The number of those who licked the water into their mouth with their hand amounted to 300, and all the rest knelt down to drink. “To lick with their hand to their mouth,” i.e., to take the water from the brook with the hollow of their hand, and lap it into the mouth with their tongue as a dog does, is only a more distinct expression for “licking with the tongue.” The 300 men who quenched their thirst in this manner were certainly not the cowardly or indolent who did not kneel down to drink in the ordinary way, either from indolence or fear, as Josephus, Theodoret, and others supposed, but rather the bravest-namely those who, when they reached a brook before the battle, did not allow themselves time to kneel down and satisfy their thirst in the most convenient manner, but simply took up some water with their hands as they stood in their military accoutrements, to strengthen themselves for the battle, and then proceeded without delay against the foe. By such a sign as this, Bertheau supposes that even an ordinary general might have been able to recognise the bravest of his army. No doubt: but if this account had not been handed down, it is certain that it would never have occurred to an ordinary or even a distinguished general to adopt such a method of putting the bravery of his troops to the test; and even Gideon, the hero of God, would never have thought of diminishing still further through such a trial an army which had already become so small, or of attempting to defeat an army of more than 100,000 men by a few hundred of the bravest men, if the Lord himself had not commanded it.
Whilst the Lord was willing to strengthen the feeble faith of Gideon by the sign with the fleece of wool, and thus to raise him up to full confidence in the divine omnipotence, He also required of him, when thus strengthened, an attestation of his faith, by the purification of his army that he might give the whole glory to Him, and accept the victory over that great multitude from His hand alone.