These were the sons of Levi by their fathers' houses; even the heads of their fathers' houses, as they were counted individually by the number of their names, that did the work for the service of the house of the LORD, from the age of twenty years and upward.
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George Leo Haydock
AD 1849
Old. See ver. 3., and Numbers iv. 3.
And upwards; as long as they were able to serve. They were excused from carrying the tabernacle, at fifty years of age, Numbers viii. 25. (Abulensis) (Menochius)
To those who were turned of thirty, the higher offices were entrusted; while the Levites began at twenty, to exercise themselves in things of less consequence, under the direction of their elder brethren. (Tirinus)
The kings might declare, by the advice of the Sanhedrim, what laws were of a temporary nature. (Grotius) (Du Hamel)