Matthew 24:44

Therefore, be ye also ready; for, in an hour that ye think not, the Son of Man is coming.

Matthew 24:50

the lord of that servant will come in a day when he is not expecting him, and in an hour when he knows not,

Matthew 25:6-13

but at midnight a cry has been made, 'Behold, the bridegroom! Come ye forth to meet him!'

1 Thessalonians 5:1-3

But, concerning the times and the seasons, brethren, ye have no need that aught be written to you;

Treasury of Scripture Knowledge

Summary

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

Bible References

He knoweth

Matthew 24:44
Therefore, be ye also ready; for, in an hour that ye think not, the Son of Man is coming.
Matthew 25:6
but at midnight a cry has been made, 'Behold, the bridegroom! Come ye forth to meet him!'
1 Thessalonians 5:1
But, concerning the times and the seasons, brethren, ye have no need that aught be written to you;