Numbers 10:4
But if they blow just one, then the leaders, the heads of the thousands of Israel, shall gather themselves to you.
Exodus 18:21
Moreover you 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 leaders of Israel, the heads of their ancestral houses, offered. These were the leaders of the tribes. These are they who were over those who were numbered:
Numbers 1:4-16
With you there shall be a man of every tribe; everyone 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.