That lapped, putting their hand to their mouth. — Literally, licked with their hand to their mouth.
All the rest of the people — i.e., 9,700 men.
Related Commentaries of Judges 7:6
Judges 7:6
6 And the number of them 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 water.