Numbers 10:4
And if they blow but with one trumpet, then the leaders, who are heads of the thousands of Israel, shall gather themselves unto you.
Exodus 18:21
Moreover you shall provide out of all the people able men, such as fear God, men of truth, hating covetousness; and place such over them, to be rulers of thousands, and rulers of hundreds, rulers of fifties, and rulers of tens:
Numbers 7:2
That the leaders of Israel, heads of the house of their fathers, who were the leaders of the tribes, and were over them that were numbered, offered:
Numbers 1:4-16
And with you there shall be a man of every tribe; every one head of the house of his fathers.
Deuteronomy 1:15
So I took the heads 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.