'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, after their families, by the house of their fathers,

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

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

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