Numbers 3:15 DBY

¹³  for every firstborn is mine. On the day that I smote all the firstborn in the land of Egypt, I hallowed unto me all the firstborn in Israel, both of man and beast; mine shall they be: I am Jehovah.

¹⁴  And Jehovah spoke to Moses in the wilderness of Sinai, saying,

¹⁵  Number the sons of Levi according to their fathers' houses, after their families; every male from a month old and upward shalt thou number them.

¹⁶  And Moses numbered them, according to the commandment of Jehovah, -- as he had been commanded.

¹⁷  And these are the sons of Levi by their names: Gershon, and Kohath, and Merari.