There are several verses in the Gospels where Jesus seems to suggest that the Second Coming would occur sooner rather than later. Like these:
When Jesus is adressing His disciples in Matthew 10 He says:
"But when they persecute you in this city, flee into the next: for verily I say unto you, Ye shall not have gone through the cities of Israel, till the Son of man be come” (Matt 10:23)
This implies that no sooner would the 70 be able to cover the cities surrounding Jerusalem than He would come again.
This passage (Matt 10:16-23) is parrallel to Luke 21:12-28, if you read them alongside it is clear that they refer to the same conversation with Jesus. In Luke, the reference to this 'coming' is far more detailed:
"And there shall be signs in sun and moon and stars; and upon the earth distress of nations, in perplexity for the roaring of the sea and the billows; men fainting for fear, and for expectation of the things which are coming on the world: for the powers of the heavens shall be shaken." Luke 21: 25,26
"And then shall they see the Son of man coming in a cloud with power and great glory. But when these things begin to come to pass, look up, and lift up your heads; because your redemption draweth nigh” (Luke 21:27,28
Some people attribute this 'coming' to the destruction of Jerusalem in 70 AD which fits well with the rest of the passage, except Jesus did not come riding on a cloud in great glory (at least not physically). But I suppose that could mean the dawn of Christianity, and therefore, redemption.
Another instance is Matthew 16:27,28:
"27 For the Son of Man will come in the glory of His Father with His angels, and then He will reward each according to his works. 28 Assuredly, I say to you, there are some standing here who shall not taste death till they see the Son of Man coming in His kingdom.”
Again Jesus talks about Himself coming in glory and judging humanity and apparently says that His disciples would be there to see it.
Sorry for such a long post! Any ideas or explanations would be greatly appreciated!
Peace out and God Bless