Luke 21:7

And they asked him ,.... That is, his disciples, when they were come to the Mount of Olives, and as he sat upon that, Matthew 24:3

saying, master, but when shall these things be ? when the temple shall be destroyed; and one stone shall not be left upon another;

and what sign will there be when these things shall come to pass ? which shows that this refers to the destruction of the temple, and so the signs following; See Gill on Matthew 24:3 .