Revelation 3:3

3 Remember, 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.

Read Revelation 3:3 Using Other Translations

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.
Remember, then, what you received and heard. Keep it, and repent. If you will not wake up, I will come like a thief, and you will not know at what hour I will come against you.
Go back to what you heard and believed at first; hold to it firmly. Repent and turn to me again. If you don’t wake up, I will come to you suddenly, as unexpected as a thief.