1Chronicles 24

As David did with the Levites, he did with the priests. That is, he organized them. Before he did so, though, he made two very good decisions. The first was to pass the throne down, which both acknowledged that he could no longer rule effectively and freed up a lot of time. The second was to find someone who knew the priesthood better than he did.

Remember, a leader doesn't have to know everything about something. He just has to know people who do.