1 Corinthians 3:3-4

for you are living your lives dominated by the mind-set of the flesh. Ask yourselves: Is there jealousy among you? Do you compare yourselves with others? Do you quarrel like children and end up taking sides? If so, this proves that you are living your lives centered on yourselves, dominated by the mind-set of the flesh, and behaving like unbelievers. For when you divide yourselves up in groups—a “Paul group” and an “Apollos group” —you’re acting like people without the Spirit’s influence.