Whenever burnt offerings were presented to the LORD on the Sabbaths, New Moons, and appointed feasts, they were to serve regularly before the LORD in the numbers prescribed for them.
Here is, I. An alteration made in the computation of the effective men of the Levites - that whereas, in Moses's time, they were not enlisted, or taken into service, till they were thirty-years old, nor admitted as probationers till twenty-five (Num 8:24), David ordered, by direction from God, that they should be numbered for the service of the house of the Lord, from the...
Commenting on 1 Chronicles 23:24-32
1Ch 23:31 “And for all the bringing of offerings to Jahve on sabbaths, the new moons, and the feasts, in the number according to the law concerning them (i.e., according to the regulations that existed for this matter), continually before Jahve.” It was the duty of the Levites to procure the necessary number of beasts for sacrifice, to see to their suitableness, to slaughter and skin them, etc.