Jesus taught in a parable that his disciples should always be ready for his return.

Matthew 25:1-13

25 Jesus continued by saying, “I will tell you something else about the time when I return from heaven as king [MET]. What will happen to many people who say that they know me will be like what happened to ten virgins who took their lanterns and went to the place where they would meet a bridegroom and go to his wedding celebration. 2 Five of the virgins were foolish and five of them were wise. 3 The virgins who were foolish took their lanterns, but they did not take any extra olive oil for the lantern. 4 But the virgins who were wise took oil in their flasks as well as in their lanterns. 5 The bridegroom was delayed, and it became late at night. So all the virgins became sleepy and fell asleep. 6 In the middle of the night someone woke them up by shouting, ‘Hey! The bridegroom is arriving! Go outside and meet him!’ 7 So all the virgins got up and trimmed their lantern wicks so that they would burn properly. 8 The foolish virgins said to the wise ones, ‘Give us some of your olive oil, because our lanterns are about to go out!’ 9 The wise virgins replied, ‘No, because there might not be enough oil for our lanterns and for yours. Go to a store and buy some for yourselves!’ 10 But while the foolish virgins were going to buy some oil, the bridegroom arrived. So the wise virgins, who were ready, went with the bridegroom to the wedding hall where the bride was waiting. Then the door was closed {someone closed the door of that hall}. 11 Later, the rest of the virgins came to the hall and they called to the bridegroom, ‘Sir, open the door for us!’ 12 But he said to them, ‘The truth is that I do not know you, so I will not open the door for you!’” 13 Then Jesus continued by saying, “So, in order that this will not happen to you, keep expecting that I will return, because you do not know when [MTY] it will be.”