'Sons of Levi' in the Bible

And, these, are the names of the sons of Levi by their generations, Gershon, and Kohath and Merari, And, the years of the life of Levi, were a hundred and thirty-seven years.

So Moses took his stand in the gate of the camp, and said - Who is for Yahweh? -- To me! Then gathered unto him all the sons of Levi,

So the sons of Levi did, according to the word of Moses, - and there fell from among the people on that day, about three thousand men.