Numbers 1:17-19

Complete Jewish Bible

¹⁷ So Moshe and Aharon took these men who had been designated by name; ¹⁸ and, on the first day of the second month, they gathered the whole assembly to state their genealogies by families and clans and recorded the names of all those twenty years old and over, as well as their total numbers. ¹⁹ Moshe counted them in the Sinai Desert, just as Adonai had ordered him.