Judges 7:6-7

6Now the number of those who lapped, putting their hand to their mouth, was 300 men, but all the rest of the people bowed down on their knees to drink water.

7Then Adonai said to Gideon, “With the 300 men who lapped I will deliver you and give the Midianites into your hand. So let all the other people go, every man to his place.”