Numbers 10:4
But when they blow only one, then the princes, who are heads of the thousands of Israel, shall gather themselves unto thee.
Exodus 18:21
Moreover thou shalt consider out of all the people men of virtue, such as fear God, men of truth, hating covetousness, and place princes over them, of thousands, of hundreds, of fifties, and of tens.
Numbers 7:2
that the princes of Israel, heads of the houses of their fathers, who were the princes of the tribes, and were over those 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 principals of your tribes, wise men and experts, and made them princes over you, princes over thousands and princes over hundreds and princes over fifties and princes over tens and officers among your tribes.