Denominations in the Early Church

1 Cor. 1:10-13 - ¹⁰ Now I plead with you, brethren, by 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 perfectly joined together in the same mind and in the same judgment. ¹¹ For it has been declared to me concerning you, my brethren, by those of Chloe’s household, that there are contentions among you. ¹² Now I say this, that each of you says, “I am of Paul,” or “I am of Apollos,” or “I am of Cephas,” or “I am of Christ.” ¹³ Is Christ divided? Was Paul crucified for you? Or were you baptized in the name of Paul?

1 Cor. 3:1-4 - ¹ And I, brethren, could not speak to you as to spiritual people but as to carnal, as to babes in Christ. ² I fed you with milk and not with solid food; for until now you were not able to receive it, and even now you are still not able; ³ for you are still carnal. For where there are envy, strife, and divisions among you, are you not carnal and behaving like mere men? ⁴ For when one says, “I am of Paul,” and another, “I am of Apollos,” are you not carnal?

Along the same lines of teaching unity, the early church taught against division. I don't even need to say anything else on this, I'll just let the bible, God's holy and infallible word, and the Holy Spirit of God speak for Himself.