'Sons of Levi' in the Bible

And these were the sons of Levi by their names; Gershon, and Kohath, and Merari.

Take the sum of the sons of Kohath from among the sons of Levi, by their families, by the house of their fathers,

And put fire in them, and put incense in them before the LORD tomorrow: and it shall be that the man whom the LORD does choose, he shall be holy: you take too much upon you, you sons of Levi.

And Moses said unto Korah, Hear, I pray you, you sons of Levi:

And he has brought you near to him, and all your brethren the sons of Levi with you: and seek you the priesthood also?