Also, according to the last precepts of David, the sons of Levi shall be counted by number from twenty years of age and upward
Other versions
King James Version
For by the last words of David the Levites were numbered from twenty years old and above: English Standard Version
For by the last words of David the sons of Levi were numbered from twenty years old and upward.New International Version
According to the last instructions of David, the Levites were counted from those twenty years old or more.