Revelation 3:3-5

3Remember, therefore, what you have received and heard; hold it fast, and repent. But if you do not wake up, I will come like a thief, and you will not know at what time I will come to you.

4Yet you have a few people in Sardis who have not soiled their clothes. They will walk with me, dressed in white, for they are worthy.

5The one who is victorious will, like them, be dressed in white. I will never blot out the name of that person from the book of life, but will acknowledge that name before my Father and his angels.