Revelation 3:1-3

1“To the angel of the church in Sardis write the following: “This is the solemn pronouncement of the one who holds the seven spirits of God and the seven stars: ‘I know your deeds, that you have a reputation that you are alive, but in reality you are dead.

2Wake up then, and strengthen what remains that was about to die, because I have not found your deeds complete in the sight of my God.

3Therefore, remember what you received and heard, and obey it, and repent. If you do not wake up, I will come like a thief, and you will never know at what hour I will come against you.