Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[215] Now, therefore, as Gideon was relating this to some young men, they believed him, and immediately there was an army of ten thousand men got ready for fighting. But God stood by Gideon in his sleep, and told him that mankind were too fond of themselves, and were enemies to such as excelled in virtue. Now that they might not pass God over, but ascribe the victory to him, and might not fancy it obtained by their own power, because they were a great many, and able of themselves to fight their enemies, but might confess that it was owing to his assistance, he advised him to bring his army about noon, in the violence of the heat, to the river, and to esteem those that bent down on their knees, and so drank, to be men of courage; but for all those that drank tumultuously, that he should esteem them to do it out of fear, and as in dread of their enemies. And when Gideon had done as God had suggested to him, there were found three hundred men that took water with their hands tumultuously; so God bid him take these men, and attack the enemy. Accordingly they pitched their camp at the river Jordan, as ready the next day to pass over it.