Matthew 24:44

So you, too, must continue to be ready, for at an hour you are not expecting Him the Son of Man will come.

Luke 21:34

But ever be on your guard, so that your hearts may not be loaded down with self-indulgence, drunkenness, and worldly worries, and that day, like a trap, catch you unawares.

1 Thessalonians 5:3

When people say, "Such peace and security!" then suddenly destruction falls upon them, like birth pains upon a woman who is about to become a mother, but they shall not escape, no, not at all.

Treasury of Scripture Knowledge

Summary

And there came against Gibeah ten thousand chosen men out of all Israel, and the battle was sore: but they knew not that evil was near them.

General references

Bible References

Knew not

Matthew 24:44
So you, too, must continue to be ready, for at an hour you are not expecting Him the Son of Man will come.
Luke 21:34
But ever be on your guard, so that your hearts may not be loaded down with self-indulgence, drunkenness, and worldly worries, and that day, like a trap, catch you unawares.
1 Thessalonians 5:3
When people say, "Such peace and security!" then suddenly destruction falls upon them, like birth pains upon a woman who is about to become a mother, but they shall not escape, no, not at all.

General references

Matthew 24:39
and knew nothing about it until the Flood came and swept them all away, so it will be at the coming of the Son of Man.