Deuteronomy 1:15; Deuteronomy 20:9

15 So I took the chief of your tribes, wise men, and known, and made them heads over you, captains over thousands, and captains over hundreds, and captains over fifties, and captains over tens, and officers among your tribes.

9 And it shall be, when the officers have made an end of speaking unto the people, that they shall make captains of the armies to lead the people.