Numbers 1:20-22

20 And there were of the children of Reuben the first–born of Israel, by their generations, after their families, by the descent from their fathers, by numbering the names according to their polls, every male from twenty years old and upward, all that were able to go forth to war;

21 Those that were numbered of the tribe of Reuben, were forty and six thousand and five hundred.

22 Of the children of Simeon, by their generations, after their families, by the descent from their fathers, those that were numbered of them, by numbering the names according to their polls, every male from twenty years old and upward, all that were able to go forth to war;