Matthew 24:42

Be watching, then! for you have no knowledge on what day your Lord will come.

Matthew 25:13

Keep watch, then, because you are not certain of the day or of the hour.

Luke 21:36

But keep watch at all times with prayer, that you may be strong enough to come through all these things and take your place before the Son of man.

Matthew 24:44

Be ready then; for at a time which you have no thought of the Son of man will come.

1 Corinthians 16:13

Be on the watch, unmoved in the faith, and be strong like men.

1 Thessalonians 5:6

So then, let us not take our rest as the others do, but let us be self-controlled and awake.

Matthew 24:36

But of that day and hour no one has knowledge, not even the angels in heaven, or the Son, but the Father only.

Revelation 16:15

(See, I come as a thief. Happy is he who is watching and keeps his robes, so that he may not go unclothed, and his shame be seen.)

Matthew 26:38-41

Then says he to them, My soul is very sad, even to death: keep watch with me here.

Mark 13:33-37

Take care, keep watch with prayer: for you are not certain when the time will be.

Luke 12:35-40

Be ready, dressed as for a journey, with your lights burning.

Romans 13:11

See then that the time has come for you to be awake from sleep: for now is your salvation nearer than when you first had faith.

1 Peter 4:7

But the end of all things is near: so be serious in your behaviour and keep on the watch with prayer;

1 Peter 5:8

Be serious and keep watch; the Evil One, who is against you, goes about like a lion with open mouth in search of food;

Revelation 3:2-3

Be on the watch, and make strong the rest of the things which are near to death; because as judged by me your works have not come up to God's measure.

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 has knowledge, not even the angels in heaven, or the Son, but the Father only.
Mark 13:33
Take care, keep watch with prayer: for you are not certain when the time will be.

General references

Matthew 24:36
But of that day and hour no one has knowledge, not even the angels in heaven, or the Son, but the Father only.
Matthew 25:13
Keep watch, then, because you are not certain of the day or of the hour.
Mark 13:33
Take care, keep watch with prayer: for you are not certain when the time will be.
Luke 12:40
So be ready: for the Son of man is coming at a time when you are not looking for him.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain