Revelation 3:3

1 “To the angel of the church in Sardis write: These are the words of the One who holds the seven Spirits of God and the seven stars. I know your deeds; you have a reputation for being alive, yet you are dead.

2 Wake up and strengthen what remains, which was about to die; for I have found your deeds incomplete in the sight of My God.

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.

4 But you do have a few people in Sardis who have not soiled their garments, and because they are worthy, they will walk with Me in white.

5 Like them, he who overcomes will be dressed in white. And I will never blot out his name from the Book of Life, but I will confess his name before My Father and His angels.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
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.
KJV
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.
WEB
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.
ASV
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.
DARBY
Remember 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.
BLB
Therefore remember what you have received and heard—and keep [it] and repent. Therefore if you shall not watch, I will come as a thief, and you shall not know at what hour I will come upon you.
ÅB
Kom derfor i hu hvordan du har lært og hørt, og ta vare på det og omvend deg! Dersom du da ikke våker, skal jeg komme som en tyv, og du skal ikke vite hva stund jeg kommer over deg.
OTB
Husk derfor hva du har mottatt og hørt; hold fast på det, og omvend deg. Hvis du ikke våker, skal jeg komme som en tyv, og du skal ikke vite hvilken time jeg kommer over deg.
B1930
Kom derfor i hu hvorledes du har lært og hørt, og ta vare på det og omvend dig! Dersom du da ikke våker, skal jeg komme som en tyv, og du skal ikke vite hvad stund jeg kommer over dig.

Study notes (Tyndale)

Original text and word study

Cross references