Revelation 3:2-3 NIV

2 Wake up! Strengthen what remains and is about to die, for I have not found your deeds complete in the sight of my God.
3 Remember, therefore, what you have received and heard; obey it, and repent.1 But if you do not wake up, I will come like a thief,2 and you will not know at what time3 I will come to you.

References for Revelation 3:3