Revelation 3:3-4
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3 Remember therefore how thou hast received and heard, and hold fast, and repent. If therefore thou shalt not watch, I will come on thee as a thief, and thou shalt not know what hour I will come upon thee.
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4 Thou hast a few names even in Sardis which have not defiled their garments; and they shall walk with me in white: for they are worthy.