Judges 7:6

4The LORD said to Gideon, “There are still too many people. Bring them down to the water, and I will test them for you there. It shall be, that those whom I tell you, ‘This shall go with you,’ shall go with you; and whoever I tell you, ‘This shall not go with you,’ shall not go.”

5So he brought down the people to the water; and the LORD said to Gideon, “Everyone who laps of the water with his tongue, like a dog laps, you shall set him by himself; likewise everyone who bows down on his knees to drink.”

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

7The LORD said to Gideon, “I will save you by the three hundred men who lapped, and deliver the Midianites into your hand. Let all the other people go, each to his own place.”

8So the people took food in their hand, and their trumpets; and he sent all the rest of the men of Israel to their own tents, but retained the three hundred men; and the camp of Midian was beneath him in the valley.