1 Corinthians

They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.

But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.

Woe unto the world because of offences! for it must needs be that offences come; but woe to that man by whom the offence cometh!

A man that is an heretick after the first and second admonition reject;

Then said he unto the disciples, It is impossible but that offences will come: but woe unto him, through whom they come!