Matthew 24:50

the lord of that servant will come in a day when he doth not expect him, and in an hour which he knows not,

Matthew 24:42-44

Watch therefore, for ye know not at what hour your Lord cometh:

1 Thessalonians 5:2-3

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

Revelation 3:3

Remember therefore how thou hast received and heard, and hold fast, and repent: for if thou be not watchful, I will come upon thee 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 at what hour your Lord cometh:
1 Thessalonians 5:2
for ye yourselves know full well, that the day of the Lord cometh like a thief in the night.
Revelation 3:3
Remember therefore how thou hast received and heard, and hold fast, and repent: for if thou be not watchful, I will come upon thee as a thief, and thou shalt not know at what hour I will come upon thee.