Exodus 18:22-25

22that they may judge the people at all times; and it shall be [that] they shall bring to thee every great matter, and that they shall judge every small matter, and they shall lighten [the task] on thee, and they shall bear [it] with thee.

23If thou do this thing, and 1God command thee [so], thou wilt be able to endure, and all this people shall also go to their place in peace.

24And Moses hearkened to the voice of his father-in-law, and did all that he had said.

25And Moses chose able men out of all Israel, and made them heads over the people, chiefs of thousands, chiefs of hundreds, chiefs of fifties, and chiefs of tens.