Numbers 10:4
But if they blow only one, then the chiefs, the heads of the tribes of Israel, shall gather themselves to you.
Exodus 18:21
Moreover, look for able men from all the people, men who fear God, who are trustworthy and hate a bribe, and place such men over the people as chiefs of thousands, of hundreds, of fifties, and of tens.
Numbers 7:2
the chiefs of Israel, heads of their fathers' houses, who were the chiefs of the tribes, who were over those who were listed, approached
Numbers 1:4-16
And there shall be with you a man from each tribe, each man being the head of the house of his fathers.
Deuteronomy 1:15
So I took the heads of your tribes, wise and experienced men, and set them as heads over you, commanders of thousands, commanders of hundreds, commanders of fifties, commanders of tens, and officers, throughout your tribes.