These were the sons of Levi after the house of their fathers; even the chief of the fathers, as they were counted by number of names by their polls, that did the work for the service of the house of the LORD, from the age of {e} twenty years and upward.

(e) David chose the Levites twice, first at the age of thirty as in 1Ch 23:3 and again afterward at twenty as the office required: at the beginning they had no charge in the temple before they were twenty-five years old, and had none after fifty, Nu 4:3.

Wesley's Notes

23:24 Twenty years - As the Levites were anciently numbered from two several times, from the twenty fifth year of their age, and from the thirtieth, Numb 4:3 8:24. In like manner they are here numbered both from their twentieth year, when they were solemnly prepared for, and instructed, and by degrees exercised in some parts of their work; and from their thirtieth year, when they were admitted to the full exercise of their office. And the reason why they were now sooner admitted to service than they had been formerly, is given in the next verse s because now their work was more easy, being wholly discharged from that burdensome work of carrying the tabernacle. Besides the people of Israel were multiplied: therefore more hands were necessary, that every Israelite who brought an offering, might find a Levite ready to assist him.

Jamieson-Fausset-Brown Bible Commentary

1Ch 23:24-32. Office of the Levites.

24-27. These were the sons of Levi . that did the work . from the age of twenty years and upward-The enumeration of the Levites was made by David (1Ch 23:3) on the same rule as that followed by Moses (Nu 4:3), namely, from thirty years. But he saw afterwards that this rule might be beneficially relaxed, and that the enrolment of Levites for their proper duties might be made from twenty years of age. The ark and tabernacle being now stationary at Jerusalem, the labor of the Levites was greatly diminished, as they were no longer obliged to transport its heavy furniture from place to place. The number of thirty-eight thousand Levites, exclusive of priests, was doubtless more than sufficient for the ordinary service of the tabernacle. But this pious king thought that it would contribute to the glory of the Lord to employ as many officers in his divine service as possible. These first rules, however, which David instituted, were temporary, as very different arrangements were made after the ark had been deposited in the tabernacle of Zion.

Matthew Henry's Concise Commentary

23:24-32 Now the people of Israel were so many, there should be more employed in the temple service, that every Israelite who brought an offering might find a Levite ready to help him. When more work is to be done, it is pity but there should be more workmen. A new heart, a spiritual mind, which delights greatly in God's commandments, and can find a refreshing feast in his ordinances, forms the great distinction between the true Christian and all other men in the world. To the spiritual man every service will yield satisfaction. He will be ever abounding in the work of the Lord; being never so happy as when employed for such a good Master, in so pleasant a service. He will not regard whether he is called to take the lead, or to keep the charge of others who are placed over him. May we seek and serve the Lord uprightly, and leave all the rest to his disposal, by faith in his word.