Matthew 24:50

the master of that servant will come in a day in which he looks not for him, and at an hour which he knows not,

Matthew 24:42-44

"Watch, therefore, for you know not at what hour your Lord is coming.

1 Thessalonians 5:2-3

for you yourselves know perfectly that the day of the Lord so comes as a thief in the night:

Revelation 3:3

Remember, therefore, how you have received and heard, and be watchful and repent. If, therefore, you do not watch, I will come upon you as a thief, and you shall not know at what hour I will 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
"Watch, therefore, for you know not at what hour your Lord is coming.
1 Thessalonians 5:2
for you yourselves know perfectly that the day of the Lord so comes as a thief in the night:
Revelation 3:3
Remember, therefore, how you have received and heard, and be watchful and repent. If, therefore, you do not watch, I will come upon you as a thief, and you shall not know at what hour I will come upon you.