Luke 12:40
Be ye therefore ready also: for the Son of man cometh at an hour when ye think not.
Cross-references
Luke 12:46 shows the consequence of not being ready: the master comes unexpectedly and punishes the unfaithful servant.
Luke 21:34-36 expands on the same warning: stay alert and pray to escape that coming day, reinforcing the need for readiness.
Matthew 24:42 is a nearly identical command to stay awake because the day of the Lord's coming is unknown.
Matthew 24:44 repeats the exact same statement about being ready for the Son of Man at an unexpected hour.
Matthew 25:13 closes the parable of the ten virgins with the same call to watch, since the day and hour are unknown.
Mark 13:33-36 warns to keep awake and not be found sleeping when the master returns unexpectedly.
1 Thessalonians 5:6 directly applies the call to be awake and sober, reinforcing the same need for constant vigilance.
1 Thessalonians 5:2 also uses the 'thief in the night' metaphor to describe the unexpected day of the Lord.
Revelation 3:3 repeats the warning that Christ will come like a thief if you do not stay awake.
Romans 13:11 calls believers to wake from sleep because salvation is nearer now, echoing the same urgency for readiness.
2 Peter 3:12 encourages waiting for and hastening the day of God, tying holy living to readiness for Christ's return.