Numbers 1:16
16 These were the ones schosen from the congregation, tthe chiefs of their ancestral tribes, the heads of the clans of Israel.
Numbers 7:2
2 hthe chiefs of Israel, heads of their fathers’ houses, who were the chiefs of the tribes, who were over those who were listed, approached
Exodus 18:21
21 Moreover, look for hable 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.