Deuteronomy 1:15; Deuteronomy 20:9

Deuteronomy 1:15

15 So I took the leading men of your tribes, wise and respected men, and appointed them to have authority over you—as commanders of thousands, of hundreds, of fifties and of tens and as tribal officials.

Deuteronomy 20:9

9 When the officers have finished speaking to the army, they shall appoint commanders over it.