Ecclesiastes 8:7

Therefore you also must be ready, for in an hour when you do not expect him, the Son of man is coming.

on a day when he is not expecting him, and at an hour which he does not know, the Master of that servant will arrive

But at midnight there arose a cry, "'Behold, the bridegroom! Go out to meet him!'

Now as to the times and the seasons, brothers, you have no need that anything be written to you.

Treasury of Scripture Knowledge

For he knoweth not that which shall be: for who can tell him when it shall be?

Therefore you also must be ready, for in an hour when you do not expect him, the Son of man is coming.

But at midnight there arose a cry, "'Behold, the bridegroom! Go out to meet him!'

Now as to the times and the seasons, brothers, you have no need that anything be written to you.