i.e. Freed from worldly cares and distractions, and enabled to give up themselves entirely to the serious study of God's law, in which many of them were ignorant, and to the instruction, and direction, and quickening of the people in their several duties.
Related Commentaries of 2 Chronicles 31:4
2 Chronicles 31:4
4 Moreover he commanded the people that dwelt in Jerusalem to give the portion of the priests and the Levites, that they might be encouraged in the law of the LORD.