William Burkitt on Mark 13:19

The dreadful calamities which were coming upon the Jews in general, and Jerusalem in particular, are here foretold by our blessed Saviour, partly from the Roman army without, and partly from the seditions and factions of the zealots within; who committed such outrages and slaughters, that there were no less than an hundred thousand Jews that bought our Saviour for thirty-pence, were now themselves sold thirty for a penny. Now did the temple itself become a sacrifice, a whole burnt-offering, and was consumed to ashes.

Yet observe, Christ promises that those days of vengeance should be shortened for the elect's sake; God had a remnant which he designed should survive that destruction, to be an holy seed; and accordingly the providence of God so ordered it, that the city was taken in six months, and the whole country depopulated in eighteen.

From whence, observe, How the Lord intermixes some mercy with the extremest misery that doth befal a people for their sin on this side hell. No sinners can say, in this life, that they feel the strikes of justice to the utmost, or that they have judgement without mercy.