Numbers 16:2-3

2And they rose up before Moses, with a number of the people of Israel, 250 chiefs of the congregation, chosen from the assembly, well-known men. 3 aThey assembled themselves together against Moses and against Aaron and said to them, b“You have gone too far! For call in the congregation are holy, every one of them, and the Lord is among them. Why then do you exalt yourselves above the assembly of the Lord?”
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