'Sons of Levi' in the Bible

These were the sons of Levi by name: Gershon and Kohath and Merari.

Let the sons of Kohath, from among the sons of Levi, be numbered by their families, in the order of their fathers' houses;

And put spices on the fire in them before the Lord tomorrow; then the man marked out by the Lord will be holy: you take overmuch on yourselves, you sons of Levi.

And Moses said to Korah, Give ear now, you sons of Levi:

Letting you, and all your brothers the sons of Levi, come near to him? and would you now be priests?