Luke 12:40

Do you also prepare, for when you are least expecting him the Son of Man will come."

Matthew 24:42

Therefore watch; for you cannot be sure on what day your Master is coming.

Matthew 24:44

Therefore, do you also prepare, since it is just when you are least expecting him that the Son of Man will come.

Matthew 25:13

Therefore watch, since you know neither the Day nor the Hour.

Mark 13:33-36

See that you are on the watch; for you do not know when the time will be.

Luke 21:34-36

Be on your guard lest your minds should ever be dulled by debauches or drunkenness or the anxieties of life, and lest 'That Day' should come suddenly upon you, like a snare.

Romans 13:11

This I say, because you know the crisis that we have reached, for the time has already come for you to rouse yourselves from sleep; our Salvation is nearer now than when we accepted the Faith.

Romans 13:14

No! Arm yourselves with the spirit of the Lord Jesus Christ, and spend no thought on your earthly nature, to satisfy its cravings.

1 Thessalonians 5:6

Therefore let us not sleep as others do. No, let us be watchful and self-controlled.

2 Peter 3:12-14

while you await and hasten the coming of the Day of God. At its coming the heavens will be dissolved in fire, and the elements melted by heat,

Revelation 19:7

Let us rejoice and exalt; and we will pay him honour, for the hour for the Marriage of the Lamb has come, and his Bride has made herself ready.

Treasury of Scripture Knowledge

Summary

Be ye therefore ready also: for the Son of man cometh at an hour when ye think not.

Bible References

General references

Luke 21:34
Be on your guard lest your minds should ever be dulled by debauches or drunkenness or the anxieties of life, and lest 'That Day' should come suddenly upon you, like a snare.
Matthew 24:42
Therefore watch; for you cannot be sure on what day your Master is coming.
Matthew 25:13
Therefore watch, since you know neither the Day nor the Hour.
Mark 13:33
See that you are on the watch; for you do not know when the time will be.
Romans 13:11
This I say, because you know the crisis that we have reached, for the time has already come for you to rouse yourselves from sleep; our Salvation is nearer now than when we accepted the Faith.
1 Thessalonians 5:6
Therefore let us not sleep as others do. No, let us be watchful and self-controlled.
2 Peter 3:12
while you await and hasten the coming of the Day of God. At its coming the heavens will be dissolved in fire, and the elements melted by heat,
Revelation 19:7
Let us rejoice and exalt; and we will pay him honour, for the hour for the Marriage of the Lamb has come, and his Bride has made herself ready.