1 Thessalonians 5:2-4

2For you know quite well that the day of the Lord’s return will come unexpectedly, like a thief in the night.

3When people are saying, “Everything is peaceful and secure,” then disaster will fall on them as suddenly as a pregnant woman’s labor pains begin. And there will be no escape.

4But you aren’t in the dark about these things, dear brothers and sisters, and you won’t be surprised when the day of the Lord comes like a thief.