Matthew 24:50

That servant's master will come on a day when he does not expect him, and at an hour of which he is unaware,

Matthew 24:42-44

Therefore watch; for you cannot be sure on what day your Master is coming.

1 Thessalonians 5:2-3

You yourselves know well that the Day of the Lord will come just as a thief comes in the night.

Revelation 3:3

Therefore remember what you have received and heard, and lay it to heart and repent. Unless you are on the watch, I shall come like a thief, and you will not know at what hour I am coming to you.

Treasury of Scripture Knowledge

Summary

The lord of that servant shall come in a day when he looketh not for him, and in an hour that he is not aware of,

Bible References

Come

Matthew 24:42
Therefore watch; for you cannot be sure on what day your Master is coming.
1 Thessalonians 5:2
You yourselves know well that the Day of the Lord will come just as a thief comes in the night.
Revelation 3:3
Therefore remember what you have received and heard, and lay it to heart and repent. Unless you are on the watch, I shall come like a thief, and you will not know at what hour I am coming to you.