Revelation 3:3-5

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. 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. “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.