Judges 7:5-7

So he brought the people down to the water. And the LORD said to Gideon, “Everyone who laps from the water with his tongue, as a dog laps, you shall set apart by himself; likewise everyone who gets down on his knees to drink.” And the number of those who lapped, putting their hand to their mouth, was three hundred men; but all the rest of the people got down on their knees to drink water. Then the LORD said to Gideon, “By the three hundred men who lapped I will save you, and deliver the Midianites into your hand. Let all the other people go, every man to his place.”