1 Corinthians 4:6 (KJV 1900)
6 And these things, brethren, I have in a figure transferred to myself and to Apollos for your sakes; that ye might learn in us not to think of men above that which is written, that no one of you be puffed up for one against another.
The problem of judging others was a problem in the Corinthian church. Paul and Apollos were not the ones struggling with it, but Paul makes it clear he is including himself and Apollos figuratively in the discussion.
Mature believers are needed to set an example in a local church. The Corinthian church can see that Apollos and Paul are not divided and are not puffed up against each other, as are the men in this local church.
Since Paul and Apollos are not puffed up…one against another, neither should the church members be puffed up against one another. Lead by example.