1 Thessalonians 5:1-6

But concerning the times and the seasons, brethren, ye have no need that aught be written unto you. For yourselves know perfectly that the day of the Lord so cometh as a thief in the night. When they are saying, Peace and safety, then sudden destruction cometh upon them, as travail upon a woman with child; and they shall in no wise escape. But ye, brethren, are not in darkness, that that day should overtake you as a thief: for ye are all sons of light, and sons of the day: we are not of the night, nor of darkness; so then let us not sleep, as do the rest, but let us watch and be sober.