The Second Coming or Second Advent refers to the Christian and Islamic belief in the return of Jesus Christ to fulfill the rest of the Messianic prophecy, such as the Resurrection of the dead, Last judgement and establishment of the Kingdom of God.
Many Christians throughout history, dating all the way back to the original disciples, have believed that they were living in the last days of history, and that Christ's return has been imminent. So far, they have all been wrong.
Some verses from the Gospels are often seen to imply that Jesus would return before the death of those to whom he was talking. Both Matthew and Luke include the statement, "This generation will not pass away until all these things have taken place" (Matthew 24:34 , Luke 21:32 ) C.S. Lewis called this "the most embarrassing verse in the Bible" in The World’s Last Night and Other Essays, though many Christians interpret the word generation from this verse in some different manner. Another verse is more explicit: "Truly I say to you, there are some of those who are standing here who shall not taste death until they see the Son of Man coming in His kingdom." (Matthew 16:28 , Mark 9:1 , Luke 9:27 ).