What does the Bible say about the church of Sardis?

In Revelation 3:4, the church of Sardis is depicted as a congregation with a troubled spiritual state, where the Lord acknowledges that they have a name that suggests they are alive, but in reality, they are dead. This passage reveals that even in such a dire situation, there are still a few faithful believers among them who have not defiled their garments. Their status highlights the truth that genuine faith can exist even in the midst of apathy and decay. The Lord's message to Sardis serves as a reminder that spiritual vitality does not solely depend on the majority or the outward appearance of a church; rather, it is the faith and walk of each individual that ultimately matters.