Judges 7:5-6

So he brought the people down to the water. Then the LORD said to Gideon, “You shall put everyone who laps the water with his tongue as a dog laps in one group, and everyone who kneels down to drink in another.” Now the number of those who lapped, putting their hand to their mouth, was three hundred men; but all the rest of the people kneeled down to drink water.