Matthew 24:50
then the master of that slave will come on a day when he does not expect him and at an hour he does not foresee,
Matthew 24:42-44
"Therefore stay alert, because you do not know on what day your Lord will come.
1 Thessalonians 5:2-3
For you know quite well that the day of the Lord will come in the same way as a thief in the night.
Revelation 3:3
Therefore, remember what you received and heard, and obey it, and repent. If you do not wake up, I will come like a thief, and you will never know at what hour I will come against you.
Proverbs 29:1
The one who stiffens his neck after numerous rebukes will suddenly be destroyed without remedy.