Bamidbar 3:14-16

Orthodox Jewish Bible

¹⁴ And Hashem spoke unto Moshe in the midbar of Sinai, saying,

¹⁵ Count the Bnei Levi by the bais of their avot, by their mishpekhot; every zachar from a month old and upward shalt thou number them.

¹⁶ And Moshe numbered them according to the command of Hashem, as he had been commanded.