35 Watch therefore, for you do not know when the master of the house is coming — in the evening, at midnight, at the crowing of the rooster, or in the morning — 36 lest, coming suddenly, he find you sleeping. 37 And what I say to you, I say to all: Watch!
— Mark 13:35–37

40 Therefore you also be ready, for the Son of Man is coming at an hour you do not expect.
— Luke 12:40

2 For you yourselves know perfectly that the day of the Lord so comes as a thief in the night. 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.
— 1 Thessalonians 5:2–3