Numbers 1:19-21

New Catholic Bible

¹⁹ as the Lord had commanded Moses. And so he counted them in the Sinai Desert.

²⁰ The Count of the Twelve Tribes. Thus the members of the tribe of Reuben, the oldest son of Israel, who were twenty years or older and who were fit to bear arms were listed by name according to their clans and families, one by one. ²¹ The number of men in the tribe of Reuben was forty-six thousand, five hundred.