Revelation 3:2-5

2Be watchful, and strengthen the things that remain, which are about to die, for I have not found thy works complete before my 1God.

3Remember therefore how thou hast received and heard, and keep [it] and repent. If therefore thou shalt not watch, I will come [upon thee] as a thief, and thou shalt not know at what hour I shall come upon thee.

4But thou hast a few names in Sardis which have not defiled their garments, and they shall walk with me in white, because they are worthy.

5He that overcomes, he shall be clothed in white garments, and I will not blot his name out of the book of life, and will confess his name before my Father and before his angels.