1 Thessalonians 5:2-3

For you yourselves know perfectly well that the day of the [return of the] Lord is coming just as a thief [comes unexpectedly and suddenly] in the night. While they are saying, “Peace and safety [all is well and secure!]” then [in a moment unforeseen] destruction will come upon them suddenly like labor pains on a woman with child, and they will absolutely not escape [for there will be no way to escape the judgment of the Lord].