1 Corinthians 3:3

3:3 for you are still influenced by the flesh. For since there is still jealousy and dissension among you, are you not influenced by the flesh and behaving like unregenerate people?

1 Corinthians 6:1

Lawsuits

6:1 When any of you has a legal dispute with another, does he dare go to court before the unrighteous rather than before the saints?