8 Bible Verses about Division Among Christians

Some men came down from Judea and taught the brothers, "Unless you are circumcised after the custom of Moses, you can't be saved." Therefore when Paul and Barnabas had no small discord and discussion with them, they appointed Paul and Barnabas, and some others of them, to go up to Jerusalem to the apostles and elders about this question. They, being sent on their way by the assembly, passed through both Phoenicia and Samaria, declaring the conversion of the Gentiles. They caused great joy to all the brothers.read more.
When they had come to Jerusalem, they were received by the assembly and the apostles and the elders, and they reported all things that God had done with them. But some of the sect of the Pharisees who believed rose up, saying, "It is necessary to circumcise them, and to command them to keep the law of Moses."

Now I beg you, brothers, look out for those who are causing the divisions and occasions of stumbling, contrary to the doctrine which you learned, and turn away from them.

Now I beg you, brothers, through the name of our Lord, Jesus Christ, that you all speak the same thing and that there be no divisions among you, but that you be perfected together in the same mind and in the same judgment. For it has been reported to me concerning you, my brothers, by those who are from Chloe's household, that there are contentions among you. Now I mean this, that each one of you says, "I follow Paul," "I follow Apollos," "I follow Cephas," and, "I follow Christ."read more.
Is Christ divided? Was Paul crucified for you? Or were you baptized into the name of Paul?

for you are still fleshly. For insofar as there is jealousy, strife, and factions among you, aren't you fleshly, and don't you walk in the ways of men?

Dare any of you, having a matter against his neighbor, go to law before the unrighteous, and not before the saints?

For first of all, when you come together in the assembly, I hear that divisions exist among you, and I partly believe it.

Beware of the dogs, beware of the evil workers, beware of the false circumcision.

They went out from us, but they didn't belong to us; for if they had belonged to us, they would have continued with us. But they left, that they might be revealed that none of them belong to us.