Numbers 3:14 YLT

¹²  'And I, lo, I have taken the Levites from the midst of the sons of Israel instead of every first-born opening a womb among the sons of Israel, and the Levites have been Mine;

¹³  for Mine 'is' every first-born, in the day of My smiting every first-born in the land of Egypt I have sanctified to Myself every first-born in Israel, from man unto beast; Mine they are; I 'am' Jehovah.'

¹⁴  And Jehovah speaketh unto Moses in the wilderness of Sinai, saying,

¹⁵  'Number the sons of Levi by the house of their fathers, by their families; every male from a son of a month and upward thou dost number them.'

¹⁶  And Moses numbereth them according to the command of Jehovah, as he hath been commanded.