Jesus prophesied of the destruction of Jerusalem, in particular of the temple, and the disciples wanted to know when that would happen and what signs would show that it was about to happen,

And He said: “Take heed that you not be deceived. For many will come in My name, saying, ‘I am He,’ and, ‘The time has drawn near.’ Therefore do not go after them. But when you hear of wars and commotions, do not be terrified; for these things must come to pass first, but the end will not come immediately” (Luke 21:8–9).

Jesus warned them that some would come claiming to be Him, or that the time has come, but they were not to go after them.

He also revealed that before the end of the temple and everything associated with it, they would hear of wars, but that was not the end.

Likewise, many today give false signs of the return of Christ, but do not listen to them, for as is obvious, they have been wrong every time.