American Standard Version
Remember therefore how thou hast received and didst hear; and keep it , and repent. If therefore thou shalt not watch, I will come as a thief, and thou shalt not know what hour I will come upon thee.

Berean Study Bible
Remember, then, what you have received and heard. Keep it and repent. If you do not wake up, I will come like a thief, and you will not know the hour when I will come upon you.

Douay-Rheims Bible
Have in mind therefore in what manner thou hast received and heard: and observe, and do penance. If then thou shalt not watch, I will come to thee as a thief, and thou shalt not know at what hour I will come to thee.

English Revised Version
Remember therefore how thou hast received and didst hear; and keep it, and repent. If therefore thou shalt not watch, I will come as a thief, and thou shalt not know what hour I will come upon thee.

King James Bible
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.

World English Bible
Remember therefore how you have received and heard. Keep it, and repent. If therefore you won't watch, I will come as a thief, and you won't know what hour I will come upon you.

Young's Literal Translation
'Remember, then, how thou hast received, and heard, and be keeping, and reform: if, then, thou mayest not watch, I will come upon thee as a thief, and thou mayest not know what hour I will come upon thee.

Revelation 3:3 Additional Translations ...