Exodus 18:21-22

21Furthermore, select capable men from among the people—God-fearing, trustworthy men who are averse to dishonest gain. Appoint them over the people as leaders of thousands, of hundreds, of fifties, and of tens.

22Have these men judge the people at all times. Then they can bring you any major issue, but all minor cases they can judge on their own, so that your load may be lightened as they share it with you.