Now Izhar's son Korah, the grandson of Kohath, a descendant of Levi, along with Eliab's sons Dathan and Abiram, and Peleth's son On, a descendant of Reuben, took charge

So Moses sent for Eliab's sons Dathan and Abiram, but they responded, "We're not coming.

Eliab's descendants were Nemuel, Dathan, and Abiram. It was Dathan and Abiram who as leaders of the community rebelled against Moses and Aaron with the followers of Korah when they rebelled against the Lord.

and what he did to Eliab's sons Dathan and Abiram, descendants of Reuben, when the ground opened up and swallowed them, their households, their tents, and every living thing belonging to them in the full sight of Israel.

And Eliab his eldest brother heard when he spake unto the men; and Eliab's anger was kindled against David, and he said, Why camest thou down hither? and with whom hast thou left those few sheep in the wilderness? I know thy pride, and the naughtiness of thine heart; for thou art come down that thou mightest see the battle.