Matthew 24:39

and knew nothing about it until the flood came and destroyed them all, so it will be at the coming of the Son of Man.

Matthew 24:50

that slave's master will come back some day when he does not expect him, and at some time of which he does not know

1 Thessalonians 5:1-3

But as to times and dates, brothers, you do not need to have anyone write to you,

2 Peter 2:3

In their greed they will exploit you with pretended arguments. From of old their condemnation has not been idle, and their destruction has not slumbered.

Treasury of Scripture Knowledge

Summary

And it came to pass, when the king of Ai saw it, that they hasted and rose up early, and the men of the city went out against Israel to battle, he and all his people, at a time appointed, before the plain; but he wist not that there were liers in ambush against him behind the city.

Bible References

He wist not

Matthew 24:39
and knew nothing about it until the flood came and destroyed them all, so it will be at the coming of the Son of Man.
1 Thessalonians 5:1
But as to times and dates, brothers, you do not need to have anyone write to you,
2 Peter 2:3
In their greed they will exploit you with pretended arguments. From of old their condemnation has not been idle, and their destruction has not slumbered.