Matthew 24:50

the lord of that servant will come in a day when he looketh not for it, and at an hour when he is not aware;

Matthew 24:42-44

Watch, therefore, for ye know not on what day your Lord is coming.

1 Thessalonians 5:2-3

for ye yourselves know full well, that the day of the Lord so cometh as a thief in the night.

Revelation 3:3

Remember therefore how thou hast received and heard, and keep those things, and repent. If therefore thou shalt not watch, I will come as a thief, and thou shalt not know at what hour I will come upon thee.

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 ye know not on what day your Lord is coming.
1 Thessalonians 5:2
for ye yourselves know full well, that the day of the Lord so cometh as a thief in the night.
Revelation 3:3
Remember therefore how thou hast received and heard, and keep those things, and repent. If therefore thou shalt not watch, I will come as a thief, and thou shalt not know at what hour I will come upon thee.