Numbers 1:17-19

17 the which princes Moses and Aaron took, with all the multitude of the common people.

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].