Matthew 24:39
and knew not of it till the deluge came and took them all away; so shall be also the coming of the Son of man.
Matthew 24:50
the lord of that servant will come in a day when he doth not expect him, and in an hour which he knows not,
Matthew 25:6
and in the middle of the night there was a cry, The bridegroom is coming, go out to meet him.
1 Thessalonians 5:2
for ye yourselves know full well, that the day of the Lord cometh like a thief in the night.
2 Peter 3:10
But the day of the Lord will come as a thief in the night, in which the heavens shall pass away with a great noise, and the elements being set on fire shall be dissolved, and the earth and the works therein shall be burnt up.