Judges 7:5-6

So he brought the people down unto the water, and the LORD said unto Gideon, Every one that laps of the water with his tongue as a dog laps, him shalt thou set by himself; likewise every one that bows down upon his knees to drink. And the number of those that lapped, putting their hand to their mouth, were three hundred men; but all the rest of the people bowed down upon their knees to drink the water.