Numbers 10:4
And if they blow but one, then the rulers, the heads of the thousands of Israel, shall gather themselves to thee.
Exodus 18:21
Moreover thou shall provide out of all the people able men, such as fear God, men of truth, hating unjust gain, and place such over them, to be rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens,
Numbers 7:2
that the rulers of Israel, the heads of their fathers' houses, offered. These were the rulers of the tribes. These are those who were over those who were numbered.
Numbers 1:4-16
And with you there shall be a man of every tribe, each one head of his fathers' house.
Deuteronomy 1:15
So I took the heads of your tribes, wise men, and known, and made them heads over you, captains of thousands, and captains of hundreds, and captains of fifties, and captains of tens, and officers, according to your tribes.