Revelation 2:14 “But I have a few things against you, because you have there those who hold the doctrine of Balaam, who taught Balak to put a stumbling block before the children of Israel, to eat things sacrificed to idols, and to commit sexual immorality.
In this verse we learn that Pergamos is not without its own faults. They have persevered and kept the name of Christ and His faith in the place where Satan’s throne resided; they even continued their works after the martyrdom of Antipas. But they had permitted other things to happen, as well.