Revelation 2

14 "But I have a few complaints against you. You tolerate some among you whose teaching is like that of Balaam, who showed Balak how to trip up the people of Israel. He taught them to sin by eating food offered to idols and by committing sexual sin.15 In a similar way, you have some Nicolaitans among you who follow the same teaching.16 Repent of your sin, or I will come to you suddenly and fight against them with the sword of my mouth.