John Gill

Verily I say unto you,.... An usual form of introducing something of moment to raise attention to it, and to ascertain the truth of it: all these things shall come upon this generation; all the things which Christ had foretold should come to pass in the present age; as that the apostles and ministers of the word he should send to them, some of them they would kill and crucify, and others they would scourge in their synagogues, or persecute from place to place; and all the horrible murders and bloodshed in any age, committed by that people, would be placed to the account of the men of that generation; and the guilt of them imputed to them, and the punishment due unto them be inflicted on them. And which came to pass, and had its full accomplishment about forty years after this, in the utter destruction of Jerusalem, and the whole nation; so that many now living were personally involved in that temporal ruin, as well as escaped not the damnation of hell, Mat 23:33.