Matthew 24:50
the lord of that servant shall come in a day when he expecteth not, and in an hour when he knoweth not,
Matthew 24:42-44
Watch therefore: for ye know not on what day your Lord cometh.
1 Thessalonians 5:2-3
For yourselves know perfectly that the day of the Lord so cometh as a thief in the night.
Revelation 3:3
Remember therefore how thou hast received and didst hear; and keep it , and repent. If therefore thou shalt not watch, I will come as a thief, and thou shalt not know what hour I will come upon thee.
Proverbs 29:1
He that being often reproved hardeneth his neck Shall suddenly be destroyed, and that without remedy.