Matthew 24:42

So keep on watching, for you do not know on what day your Lord is coming.

Matthew 25:13

So you must keep on watching, for you do not know either the day or the hour.

Luke 21:36

But ever be watching and always praying, so that you may have strength to escape all this that is going to take place, and so you may take your stand in the presence of the Son of Man."

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.

1 Corinthians 16:13

Be always on your guard; stand firm in your faith; keep on acting like men; continue to grow in strength;

1 Thessalonians 5:6

So let us stop sleeping as others do, but let us stay awake and keep sober.

Matthew 24:36

But about that day or hour not a single one knows -- not even the angels in heaven or the Son; not a single one but the Father alone.

Revelation 16:15

(See! I am coming like a thief! Blessed is he who stays awake and keeps his clothes ready, so that he may not go naked and people see his shame.)

Matthew 26:38-41

Then He said to them, "My heart is breaking, it almost kills me! You must stay here and keep watching with me."

Mark 13:33-37

Keep looking, keep alert, for you do not know when the time will be.

Luke 12:35-40

"You must keep your belts tight and your lamps burning,

Romans 13:11

Do this in particular because you know the present crisis, that it is high time for you to wake up out of your sleep, for our salvation is now nearer to us than when we first believed.

1 Peter 4:7

But the end of everything on earth is near. So be serious and sober minded, that you may give yourselves to prayer.

1 Peter 5:8

Be calm and alert. Your opponent the devil is always prowling about like a roaring lion, trying to devour you.

Revelation 3:2-3

Wake up, and strengthen what is left, although it is on the very point of dying, for I have not found a thing that you have done complete in the sight of God.

Treasury of Scripture Knowledge

Summary

Watch therefore: for ye know not what hour your Lord doth come.

Bible References

For

Matthew 24:36
But about that day or hour not a single one knows -- not even the angels in heaven or the Son; not a single one but the Father alone.
Mark 13:33
Keep looking, keep alert, for you do not know when the time will be.

General references

Matthew 24:36
But about that day or hour not a single one knows -- not even the angels in heaven or the Son; not a single one but the Father alone.
Matthew 25:13
So you must keep on watching, for you do not know either the day or the hour.
Mark 13:33
Keep looking, keep alert, for you do not know when the time will be.
Luke 12:40
So you, too, must always be ready, for at an hour that you are not expecting, the Son of Man will come."