Matthew 24:42

Watch therefore: for ye know not at what hour your Master cometh.

Matthew 25:13

Watch therefore, for ye know not the day nor the hour in which the Son of man cometh.

Luke 21:36

Watch therefore, praying at every proper opportunity, that ye may be accounted worthy to escape all these things which are ready to come to pass, and to stand before the Son of man.

Matthew 24:44

Therefore be ye also prepared: for in an hour that ye think not, the Son of man cometh.

1 Corinthians 16:13

Watch ye, stand fast in the faith, be manful, be strong.

1 Thessalonians 5:6

Let us not then sleep as do others; but let us watch and be sober.

Matthew 24:36

But of that day and hour no man knoweth, not even the angels of heaven, but my Father alone.

Revelation 16:15

Behold, I come as a thief. Blessed is he who watcheth, and keepeth his garments, that he walk not about naked, and men see his shame.

Matthew 26:38-41

Then saith he to them. My soul is exceeding sorrowful even to death: abide here, and watch with me.

Mark 13:33-37

Take ye heed, watch, and pray; for ye know not when the time is.

Luke 12:35-40

Let your loins be firmly girded round, and your lamps burning:

Romans 13:11

And thus do, knowing the time; for the hour is come that we should awake from sleep, for now our salvation is nearer than when we believed.

1 Peter 4:7

But the end of all things is near: be ye therefore sober-minded, and vigilant in prayers.

1 Peter 5:8

Be sober, be vigilant; for your adversary the devil, as a roaring lion, prowleth around, seeking whom he may devour:

Revelation 3:2-3

Be vigilant and strengthen the things which remain, which are ready to die; for I have not found thy works complete before 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 of that day and hour no man knoweth, not even the angels of heaven, but my Father alone.
Mark 13:33
Take ye heed, watch, and pray; for ye know not when the time is.

General references

Matthew 24:36
But of that day and hour no man knoweth, not even the angels of heaven, but my Father alone.
Matthew 25:13
Watch therefore, for ye know not the day nor the hour in which the Son of man cometh.
Mark 13:33
Take ye heed, watch, and pray; for ye know not when the time is.
Luke 12:40
Therefore be ye also ready, for at an hour that ye think not of, the Son of man cometh.