"But even if we, or an angel from heaven, preach to you a gospel other than the one you have heard from us then let him be accursed... Woe to them, because they have gone in the way of Cain, and rushed for profit to the error of Balaam, and perished in the rebellion of Korah... They went out from us, but they were never from us. For if they had belonged to us, they would have remained with us. But their departure made it clear that none of them belonged to us..." (Galatians 1:8; Jude 1:11; 1 John 2:19)