Revelation 2:14-16

But I have a few things against you. You have some there who hold to the teaching of Balaam,   who taught Balak to place a stumbling block   in front of the Israelites: to eat meat sacrificed to idols   and to commit sexual immorality.   In the same way, you also have those who hold to the teaching of the Nicolaitans.   So repent! Otherwise, I will come to you quickly   and fight against them with the sword of my mouth.