For you yourselves know perfectly that the day of the Lord so comes as a thief in the night.
1 Thessalonians 5:2
Surrounding context
5:1 But concerning the times and the seasons, brethren, you have no need that I should write to you.
5:2 For you yourselves know perfectly that the day of the Lord so comes as a thief in the night.
5:3 For when they say, "Peace and safety!" then sudden destruction comes upon them, as labor pains upon a pregnant woman. And they shall not escape.