Numbers 3:15 KJV
Number the children of Levi after the house of their fathers, by their families: every male from a month old and upward shalt thou number them.
Numbers 3:15, King James Version
In context
14 And the Lord spake unto Moses in the wilderness of Sinai, saying,
15 Number the children of Levi after the house of their fathers, by their families: every male from a month old and upward shalt thou number them.
16 And Moses numbered them according to the word of the Lord, as he was commanded.