Luke 12:40

Ye, therefore, be getting ready, because, in what hour ye are not thinking, The Son of an cometh!

Matthew 24:42

Be watching, therefore, for ye know not, on what manner of day, your Lord is coming.

Matthew 24:44

Wherefore, ye also, be getting ready, because, in what hour ye are, not thinking, The Son of Man doth come.

Matthew 25:13

Be watching, therefore, because ye know, neither the day nor the hour.

Mark 13:33-36

Be taking heed, be watching, for ye know not, when, the season is: -

Luke 21:34-36

But be taking heed unto yourselves, lest once your hearts be made heavy - with debauch and drunkenness and anxieties about livelihood, and that day come upon you suddenly,

Romans 13:11

And, this besides, - knowing the season - that it is an hour already for you out of sleep to be wakened; for, now, is our salvation nearer than when we believed:

Romans 13:14

But put ye on the Lord Jesus Christ, and, for the flesh, take not forethought to fulfil its covetings.

1 Thessalonians 5:6

Hence, then, let us not be sleeping, as the rest, but let us watch and be sober: -

2 Peter 3:12-14

Expecting and hastening the presence of the day of God, by reason of which, heavens, being on fire, will be dissolved, and, elements, becoming intensely hot, are to be melted;

Revelation 19:7

Let us rejoice and exult, and give glory unto him, because the marriage of the Lamb, is come, and, his wife, hath 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
But be taking heed unto yourselves, lest once your hearts be made heavy - with debauch and drunkenness and anxieties about livelihood, and that day come upon you suddenly,
Matthew 24:42
Be watching, therefore, for ye know not, on what manner of day, your Lord is coming.
Matthew 25:13
Be watching, therefore, because ye know, neither the day nor the hour.
Mark 13:33
Be taking heed, be watching, for ye know not, when, the season is: -
Romans 13:11
And, this besides, - knowing the season - that it is an hour already for you out of sleep to be wakened; for, now, is our salvation nearer than when we believed:
1 Thessalonians 5:6
Hence, then, let us not be sleeping, as the rest, but let us watch and be sober: -
2 Peter 3:12
Expecting and hastening the presence of the day of God, by reason of which, heavens, being on fire, will be dissolved, and, elements, becoming intensely hot, are to be melted;
Revelation 19:7
Let us rejoice and exult, and give glory unto him, because the marriage of the Lamb, is come, and, his wife, hath made herself ready;