Numbers 16:11

and in the morning you will see the glory of Yahweh, for He hears your grumblings against Yahweh; and what are we, that you grumble against us?”

Now the people became like those who complain of calamity in the ears of Yahweh. And Yahweh heard it and His anger was kindled, and the fire of Yahweh burned among them and consumed some of the outskirts of the camp.

and what He did to Dathan and Abiram, the sons of Eliab, the son of Reuben, when the earth opened its mouth and swallowed them, their households, their tents, and every living thing that followed them, among all Israel—

These are grumblers, finding fault, following after their own lusts; and their mouth speaks arrogantly, flattering people for the sake of their own benefit.