Revelation 3:3 Remember therefore how you have received and heard; hold fast and repent. Therefore if you will not watch, I will come upon you as a thief, and you will not know what hour I will come upon you.
Matthew 24:42-44 Watch therefore, for you do not know what hour your Lord is coming. But know this, that if the master of the house had known what hour the thief would come, he would have watched and not allowed his house to be broken into. Therefore you also be ready, for the Son of Man is coming at an hour you do not expect.
Matthew 25:1-13 "Then the kingdom of heaven shall be likened to ten virgins who took their lamps and went out to meet the bridegroom. Now five of them were wise, and five were foolish. Those who were foolish took their lamps and took no oil with them, but the wise took oil in their vessels with their lamps. But while the bridegroom was delayed, they all slumbered and slept. "And at midnight a cry was heard: "Behold, the bridegroom is coming; go out to meet him!" Then all those virgins arose and trimmed their lamps. And the foolish said to the wise, "Give us some of your oil, for our lamps are going out." But the wise answered, saying, "No, lest there should not be enough for us and you; but go rather to those who sell, and buy for yourselves." And while they went to buy, the bridegroom came, and those who were ready went in with him to the wedding; and the door was shut. "Afterward the other virgins came also, saying, "Lord, Lord, open to us!" But he answered and said, "Assuredly, I say to you, I do not know you." "Watch therefore, for you know neither the day nor the hour in which the Son of Man is coming.
1 Thessalonians 5:2-3 For you yourselves know perfectly that the day of the Lord so comes as a thief in the night. For when they say, "Peace and safety!" then sudden destruction comes upon them, as labor pains upon a pregnant woman. And they shall not escape.
2 Peter 3:1-2 Beloved, I now write to you this second epistle (in both of which I stir up your pure minds by way of reminder), that you may be mindful of the words which were spoken before by the holy prophets, and of the commandment of us, the apostles of the Lord and Savior,
2 Peter 3:4 and saying, "Where is the promise of His coming? For since the fathers fell asleep, all things continue as they were from the beginning of creation."