Matthew 24:42

Watch therefore: because you do not know on what day your Lord cometh.

Matthew 25:13

Watch therefore, because you know neither the day nor the hour.

Luke 21:36

Therefore watch, praying all the time, that you may be counted worthy to escape all these things which are about to come to pass, and to stand before the Son of man.

Matthew 24:44

Therefore be ye also ready: because the Son of man cometh in an hour at which you do not think.

1 Corinthians 16:13

Watch, stand in the faith, be men, be strong.

1 Thessalonians 5:6

then therefore let us not sleep like the rest, but watch and be sober.

Matthew 24:36

Concerning that day or hour no one knows, neither the angels of the heavens, except my Father only.

Revelation 16:15

Behold, I am coming as a thief; blessed is the one watching and keeping his garments, in order that he may not walk about naked, and they may see his shame.

Matthew 26:38-41

Then He says to them, My soul is exceedingly sorrowful, even unto death: abide here, and pray with me.

Mark 13:33-37

Beware, watch; for you know not when the time is.

Luke 12:35-40

Let your loins be girted, and your lamps burning;

Romans 13:11

And recognizing this time, that it is already the hour we should wake out of sleep: for now our salvation is nearer than when we believed.

1 Peter 4:7

But the end of all things is at hand. Therefore be prudent, and sober unto prayers:

1 Peter 5:8

Be sober, watch. The devil is walking round like a roaring lion, seeking some one to devour:

Revelation 3:2-3

Be you watchful, and strengthen the remaining things, which are about to die. For I have not found your works perfect 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
Concerning that day or hour no one knows, neither the angels of the heavens, except my Father only.
Mark 13:33
Beware, watch; for you know not when the time is.

General references

Matthew 24:36
Concerning that day or hour no one knows, neither the angels of the heavens, except my Father only.
Matthew 25:13
Watch therefore, because you know neither the day nor the hour.
Mark 13:33
Beware, watch; for you know not when the time is.
Luke 12:40
Be ye also ready: because at an hour you do not think the Son of man cometh.