1 Thessalonians 5:2, 4-6

For you yourselves know full well that the day of the Lord will come just like a thief in the night.

But you, brethren, are not in darkness, that the day would overtake you like a thief; for you are all sons of light and sons of day. We are not of night nor of darkness; so then let us not sleep as others do, but let us be alert and sober.