Luke 12:40

You too, be continually ready; because the Son of Man is coming at an hour that you do not expect.”

Matthew 24:42

“So be alert [give strict attention, be cautious and active in faith], for you do not know which day [whether near or far] your Lord is coming.

Matthew 24:44

Therefore, you [who follow Me] must also be ready; because the Son of Man is coming at an hour when you do not expect Him.

Matthew 25:13

Therefore, be on the alert [be prepared and ready], for you do not know the day nor the hour [when the Son of Man will come].

Mark 13:33-36

“Be on guard and stay constantly alert [and pray]; for you do not know when the appointed time will come.

Luke 21:34-36

“But be on guard, so that your hearts are not weighed down and depressed with the giddiness of debauchery and the nausea of self-indulgence and the worldly worries of life, and then that day [when the Messiah returns] will not come on you suddenly like a trap;

Romans 13:11

Do this, knowing that this is a critical time. It is already the hour for you to awaken from your sleep [of spiritual complacency]; for our salvation is nearer to us now than when we first believed [in Christ].

Romans 13:14

But clothe yourselves with the Lord Jesus Christ, and make no provision for [nor even think about gratifying] the flesh in regard to its improper desires.

1 Thessalonians 5:6

So then let us not sleep [in spiritual indifference] as the rest [of the world does], but let us keep wide awake [alert and cautious] and let us be sober [self-controlled, calm, and wise].

2 Peter 3:12-14

[while you earnestly] look for and await the coming of the day of God. For on this day the heavens will be destroyed by burning, and the [material] elements will melt with intense heat!

Revelation 19:7

Let us rejoice and shout for joy! Let us give Him glory and honor, for the marriage of the Lamb has come [at last] and His bride (the redeemed) has prepared herself.”

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
“But be on guard, so that your hearts are not weighed down and depressed with the giddiness of debauchery and the nausea of self-indulgence and the worldly worries of life, and then that day [when the Messiah returns] will not come on you suddenly like a trap;
Matthew 24:42
“So be alert [give strict attention, be cautious and active in faith], for you do not know which day [whether near or far] your Lord is coming.
Matthew 25:13
Therefore, be on the alert [be prepared and ready], for you do not know the day nor the hour [when the Son of Man will come].
Mark 13:33
“Be on guard and stay constantly alert [and pray]; for you do not know when the appointed time will come.
Romans 13:11
Do this, knowing that this is a critical time. It is already the hour for you to awaken from your sleep [of spiritual complacency]; for our salvation is nearer to us now than when we first believed [in Christ].
1 Thessalonians 5:6
So then let us not sleep [in spiritual indifference] as the rest [of the world does], but let us keep wide awake [alert and cautious] and let us be sober [self-controlled, calm, and wise].
2 Peter 3:12
[while you earnestly] look for and await the coming of the day of God. For on this day the heavens will be destroyed by burning, and the [material] elements will melt with intense heat!
Revelation 19:7
Let us rejoice and shout for joy! Let us give Him glory and honor, for the marriage of the Lamb has come [at last] and His bride (the redeemed) has prepared herself.”