2 Chronicles 31:16

American Standard Version 2015

besides them that were reckoned by genealogy of males, from three years old and upward, even every one that entered into the house of Jehovah, as the duty of every day required, for their service in their offices according to their courses;

Cross References

Ezra 3:4

And they kept the feast of tabernacles, as it is written, and {\i offered} the daily burnt-offerings by number, according to the ordinance, as the duty of every day required;

1 Chronicles 23:3

And the Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty and eight thousand.