'Heads of the Tribes' in the Bible

These are the men named out of all the people, chiefs of their fathers' houses, heads of the tribes of Israel.

And Moses said to the heads of the tribes of the children of Israel, This is the order of the Lord.

And these are the heritages which the children of Israel took in the land of Canaan, which Eleazar, the priest, and Joshua, the son of Nun, and the heads of the tribes of the children of Israel, gave out to them;