1 Thessalonians (1 Th) 5:1-6

But you have no need to have anything written to you, brothers, about the times and dates when this will happen; because you yourselves well know that the Day of the Lord will come like a thief in the night. When people are saying, “Everything is so peaceful and secure,” then destruction will suddenly come upon them, the way labor pains come upon a pregnant woman, and there is no way they will escape. But you, brothers, are not in the dark, so that the Day should take you by surprise like a thief; for you are all people who belong to the light, who belong to the day. We don’t belong to the night or to darkness, so let’s not be asleep, like the rest are; on the contrary, let us stay alert and sober.