1 Corinthians 6:4
6 “If then you have to judge things pertaining to this life, set them to judge who are of no account in the Church.”
Wishing to instruct us as forcibly as possible that they ought not to commit themselves to those without, whatsoever the matter may be; having raised what seemed to be an objection, he answers it in the first instance. For what he says is something like this: Perhaps some one will say, “No one among you is wise, nor competent to pass sentence; all are contemptible.” Now what follows? “Even though none be wise,” says he, “I bid you entrust things to those who are of least weight.”
Source: Homilies on First Corinthians (New Advent)