What does the Bible say about the church at Sardis?

In Revelation 3:1-6, God critiques the church at Sardis for having a name that they are alive, yet they are in fact dead. The letter highlights their lack of commendation from God and the call to repentance and vigilance. God admonishes them to strengthen what remains and warns of His coming judgment if they do not repent. This somber message serves as a wake-up call for both the church at Sardis and for believers today to examine their spiritual vitality and commitment to true faith and works in Christ.