Revelation 3:1-6 (CSB)
“Write to the angel of the church in Sardis: Thus says the one who has the seven spirits of God and the seven stars: I know your works; you have a reputation for being alive, but you are dead. 2 Be alert and strengthen what remains, which is about to die, for I have not found your works complete before my God. 3 Remember, then, what you have received and heard; keep it, and repent. If you are not alert, I will come like a thief, and you have no idea at what hour I will come upon you. 4 But you have a few people in Sardis who have not defiled their clothes, and they will walk with me in white, because they are worthy.
5 “In the same way, the one who conquers will be dressed in white clothes, and I will never erase his name from the book of life but will acknowledge his name before my Father and before his angels.
6 “Let anyone who has ears to hear listen to what the Spirit says to the churches.

Christian Standard Bible (Nashville, TN: Holman Bible Publishers, 2020), Re 3:1–6.