Adam Clarke on 1 Chronicles 28:21

Behold, the courses of the priests - The priests and the Levites, the cunning artificers, and the princes of the people, will be at thy command. Thus David, having assigned him his work, and described the manner in which it was to be done, shows him who were to be his assistants in it, and encourages him in the great undertaking.

Here we find piety, good sense, prudence, zeal for the public welfare and God's glory, the strongest attachments to the worship of Jehovah, and concern for the ordinances of religion, all united; and Solomon has his danger, his duty, and his interest placed before him in the truest and most impressive light by his pious and sensible father.