Revelation 2:14 "But I have a few things against you, because you have there some who hold the doctrine of Balaam, who taught Balak to cast a stumbling block before the sons of Israel, both to eat things sacrificed to idols, and to commit fornication."

Revelation 2:12-13   12 "And to the angel of the church in Pergamos write, 'These things says He who has the sharp two-edged sword:  13 "I know your works, and where you live, where Satan's throne is. And you hold fast to My name, and did not deny My faith in the days in which Antipas was My faithful witness, who was killed among you, where Satan is dwelling.