'Parties' in the Bible

What then is Apollos? And what is Paul? Just servants through whom you believed [in Christ], even as the Lord appointed to each his task.

Now I have applied these things [that is, the analogies about factions] to myself and Apollos for your benefit, believers, so that you may learn from us not to go beyond what is written [in Scripture], so that none of you will become arrogant and boast in favor of one [minister or teacher] against the other.

for [doubtless] there have to be factions among you, so that those who are of approved character may be clearly recognized among you.