Numbers 1:44-47

44These are those that were numbered, whom Moses and Aaron numbered, and the princes of Israel, the twelve men: each one was for the house of his fathers.

45And all those that were numbered of the children of Israel, according to their fathers' houses, from twenty years old and upward, all that went forth to military service in Israel,

46all they that were numbered were six hundred and three thousand five hundred and fifty.

47But the Levites after the tribe of their fathers were not numbered among them.