Matthew 24:39
having no thoughts of the flood till it came, and swept them all away; so shall also the advent of the son of man be.
Matthew 24:50
the master of that servant will come in a day when he least expects it, and at an hour he is not aware of;
Matthew 25:6
and at midnight there was a sudden cry, see the bridegroom comes; go and meet him.
1 Thessalonians 5:2
for you very well know, that the day of the Lord steals on like a thief in the night.
2 Peter 3:10
As for that day of the Lord, it will advance like a thief: then the heavens will rush with violence, the boiling elements will be dissolved, and the earth with all its contents, shall be burnt away.