'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 their fathers houses,

and put fire in them, and put incense upon them before Jehovah to-morrow: and it shall be that the man whom Jehovah doth choose, he'shall be holy: ye take too much upon you, ye sons of Levi.

And Moses said unto Korah, Hear now, ye sons of Levi:

and that he hath brought thee near, and all thy brethren the sons of Levi with thee? and seek ye the priesthood also?