Matthew 24:50

the master of that servant will come in a day when he least expects it, and at an hour he is not aware of;

Matthew 24:42-44

watch therefore, for ye know not at what hour your Lord shall come.

1 Thessalonians 5:2-3

for you very well know, that the day of the Lord steals on like a thief in the night.

Revelation 3:3

remember therefore what thou hast received and heard: observe it and repent. if therefore thou art not vigilant, I will come upon thee as a thief, thou shalt not know 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 at what hour your Lord shall come.
1 Thessalonians 5:2
for you very well know, that the day of the Lord steals on like a thief in the night.
Revelation 3:3
remember therefore what thou hast received and heard: observe it and repent. if therefore thou art not vigilant, I will come upon thee as a thief, thou shalt not know what hour I will come upon thee.