Verse 30. Of the Lord - In all things which concerned the house or worship of God; to take care that such monies as were given towards building the temple, or towards the sacrifices and other holy ministrations should be gathered and received, and faithfully sent up to Jerusalem; and to see to the execution of all the laws of God among the people. Service of, &c. - They served the king in the execution of his decrees, by which the several rights of the king and people were established. And as the king was the principal person intrusted with the execution of God's laws, so these Levites chiefly were his eyes by which he saw his people's transgressions, and his hands by which he inflicted due censures upon them for their miscarriages.
Verse 31. Fortieth year - His last year, in which he made all the orders of families and officers recorded in these chapters. We should be so much the more diligent in doing good, as we see the day approaching. If we live not to enjoy the fruit of our labours, let us not grudge it to them that come after us.