Judges 7:5-7

So he brought the people down to the water. And the LORD said to Gideon, “You shall separate everyone who laps the water with his tongue as a dog laps, as well as everyone who kneels to drink.” Now the number of those who lapped, putting their hand to their mouth, was 300 men; but all the rest of the people kneeled to drink water. The LORD said to Gideon, “I will deliver you with the 300 men who lapped and will give the Midianites into your hands; so let all the other people go, each man to his home.”