Charles Ellicott Commentary 1 Corinthians 4:3

"But with me it is a very small thing that I should be judged of you, or of man`s judgment: yea, I judge not mine own self." — 1 Corinthians 4:3 (ASV)

But with me it is a very small thing . . .—However, since the Corinthians had actually “judged” various of their teachers, the Apostle assures them that their judgment—or the judgment of the world generally—is to him a very small matter—indeed, no earthly judgment is of any concern to him. He does not even judge himself as worthy and faithful because he is not conscious of any unfaithfulness; yet that is no justification to him—his only judge is the Lord.

Man’s judgment.—The literal translation is man’s day. Some have thought they saw in it a provincialism or a Hebraism. Probably, however, the explanation is that St. Paul lived with the idea of the day of the Lord as the judgment day so constantly before him that he uses the words as synonymous. (Compare also 1 Corinthians 3:13, the day shall declare it.)