Matthew 24:50

that servant's lord and master will arrive on a day when he does not expect him and at an hour which he does not know;

Matthew 24:42-44

Keep on the watch then, for you never know what day your Lord will come.

1 Thessalonians 5:2-3

You know perfectly well that the day of the Lord comes like a thief in the night;

Revelation 3:3

Now remember what you received and heard, hold to it and repent. If you will not wake up, I shall come like a thief; you will not know at what hour I come upon 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
Keep on the watch then, for you never know what day your Lord will come.
1 Thessalonians 5:2
You know perfectly well that the day of the Lord comes like a thief in the night;
Revelation 3:3
Now remember what you received and heard, hold to it and repent. If you will not wake up, I shall come like a thief; you will not know at what hour I come upon you.