Matthew 24:42

Watch therefore, for ye know not in what hour your Lord comes.

Matthew 25:13

Watch therefore, for ye know not the day nor the hour.

Luke 21:36

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

Matthew 24:44

Wherefore ye also, be ye ready, for in that hour that ye think not the Son of man comes.

1 Corinthians 16:13

Be vigilant; stand fast in the faith; quit yourselves like men; be strong.

1 Thessalonians 5:6

So then do not let us sleep as the rest do, but let us watch and be sober;

Matthew 24:36

But of that day and hour no one knows, not even the angels of the heavens, but my Father alone.

Revelation 16:15

(Behold, I come as a thief. Blessed is he that watches and keeps his garments, that he may not walk naked, and that they may not see his shame.)

Matthew 26:38-41

Then he says to them, My soul is very sorrowful even unto death; remain here and watch with me.

Mark 13:33-37

Take heed, watch and pray, for ye do not know when the time is:

Luke 12:35-40

Let your loins be girded about, and lamps burning;

Romans 13:11

This also, knowing the time, that it is already time that we should be aroused out of sleep; for now is our salvation nearer than when we believed.

1 Peter 4:7

But the end of all things is drawn nigh: be sober therefore, and be watchful unto prayers;

1 Peter 5:8

Be vigilant, watch. Your adversary the devil as a roaring lion walks about seeking whom he may devour.

Revelation 3:2-3

Be watchful, and strengthen the things that remain, which are about to die, for I have not found thy works complete before my 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 one knows, not even the angels of the heavens, but my Father alone.
Mark 13:33
Take heed, watch and pray, for ye do not know when the time is:

General references

Matthew 24:36
But of that day and hour no one knows, not even the angels of the heavens, but my Father alone.
Matthew 25:13
Watch therefore, for ye know not the day nor the hour.
Mark 13:33
Take heed, watch and pray, for ye do not know when the time is:
Luke 12:40
And ye therefore, be ye ready, for in the hour in which ye do not think it, the Son of man comes.