Revelation 3:3

Remember, therefore, how you have received and heard, and hold fast, and reform: therefore, unless you are watchful, I will come upon you as thief, and you shall not know what hour I will come upon you.

Revelation 18:9-10

And the kings of the earth, who have committed fornication, and lived in luxury with her, shall mourn and lament, when they shall see the smoke of her burning,

Treasury of Scripture Knowledge

Summary

Therefore shall evil come upon thee; thou shalt not know from whence it riseth: and mischief shall fall upon thee; thou shalt not be able to put it off: and desolation shall come upon thee suddenly, which thou shalt not know.

Thou shalt not know

Thou shalt not be

Bible References

Thou shalt not know

Revelation 3:3
Remember, therefore, how you have received and heard, and hold fast, and reform: therefore, unless you are watchful, I will come upon you as thief, and you shall not know what hour I will come upon you.

Thou shalt not be

Revelation 18:9
And the kings of the earth, who have committed fornication, and lived in luxury with her, shall mourn and lament, when they shall see the smoke of her burning,