Numbers 10:4
And if they blow but one, then the princes, the heads of the thousands of Israel, shall gather themselves unto thee.
Exodus 18:21
Moreover thou shalt 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 princes of Israel, the heads of their fathers houses, offered. These were the princes of the tribes, these are they that were over them that were numbered:
Numbers 1:4-16
And with you there shall be a man of every tribe; every 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.