Numbers 1:16

“With you, moreover, there shall be a man of each tribe, each one head of his father’s household.

Then the leaders of Israel, the heads of their fathers’ households, brought an offering near (they were the leaders of the tribes; they were the ones who were over the numbered men).

“Yet if only one is blown, then the leaders, the heads of the divisions of Israel, shall assemble before you.

and they rose up before Moses, together with some of the sons of Israel, 250 leaders of the congregation, those called upon by the assembly, men of renown.

And the sons of Eliab: Nemuel and Dathan and Abiram. These are the Dathan and Abiram who were called upon by the congregation, who contended against Moses and against Aaron in the congregation of Korah, when they contended against Yahweh,

Then Moses spoke to the heads of the tribes of the sons of Israel, saying, “This is the word which Yahweh has commanded.