Revelation 3:1-4

1“To the angel (divine messenger) of the church in Sardis write: These are the words of Him who has the seven Spirits of God and the seven stars: ‘I know your deeds; you have a name (reputation) that you are alive, but [in reality] you are dead.

2Wake up, and strengthen and reaffirm what remains [of your faithful commitment to Me], which is about to die; for I have not found [any of] your deeds completed in the sight of My God or meeting His requirements.

3So remember and take to heart the lessons you have received and heard. Keep and obey them, and repent [change your sinful way of thinking, and demonstrate your repentance with new behavior that proves a conscious decision to turn away from sin]. So then, if you do not wake up, I will come like a thief, and you will not know at what hour I will come to you.

4But you [still] have a few people in Sardis who have not soiled their clothes [that is, contaminated their character and personal integrity with sin]; and they will walk with Me [dressed] in white, because they are worthy (righteous).