Numbers 1:18-20

18 And they gathered in the first day of the second month, and they told [or numbered] them by kindreds, and houses, and meines, and heads, and names of each by themselves, from the twentieth year and above,

19 as the Lord commanded to Moses; [and they be numbered in the desert of Sinai].

20 And of Reuben, the first begotten of Israel, were numbered, in the desert of Sinai, [or Of Reuben, the first begotten of Israel], by their generations, and meines, and houses, and by the names of all the heads, all thing that is of male kind, from twenty years and above, of men going forth to battle,