What does Revelation 2:14 mean?

But I have a few things against you: Some of you are holding on to the teaching of Balaam, who taught Balak to trip up the Israelites by getting them to eat food offered to idols and to sleep with people they shouldn’t. Revelation 2:14 - Modern Text Bible

(He criticizes them for tolerating people who lead others into compromise—specifically, idolatry and sexual immorality, like Balaam did in the Old Testament.)