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

Matthew 25:6

But in the middle of the night there was a shout 'Here is the bridegroom! Come out and meet him!'

1 Thessalonians 5:2

for you yourselves know perfectly well that the Day of the Lord is to come like a thief in the night.

2 Peter 3:10

The Day of the Lord will come like a thief; on it the heavens will pass away with a roar, the heavenly bodies will burn up and be destroyed, and the earth and all its works will melt away.

Treasury of Scripture Knowledge

Summary

So Joshua arose, and all the people of war, to go up against Ai: and Joshua chose out thirty thousand mighty men of valour, and sent them away by night.

Bible References

By night

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 25:6
But in the middle of the night there was a shout 'Here is the bridegroom! Come out and meet him!'
1 Thessalonians 5:2
for you yourselves know perfectly well that the Day of the Lord is to come like a thief in the night.
2 Peter 3:10
The Day of the Lord will come like a thief; on it the heavens will pass away with a roar, the heavenly bodies will burn up and be destroyed, and the earth and all its works will melt away.