Revelation 2:13-14
2:13 ‘I know where you live – where Satan’s throne is. Yet you continue to cling to my name and you have not denied your faith in me, even in the days of Antipas, my faithful witness, who was killed in your city where Satan lives.
2:14 But I have a few things against you: You have some people there who follow the teaching of Balaam, who instructed Balak to put a stumbling block before the people of Israel so they would eat food sacrificed to idols and commit sexual immorality.