It is the custom of the Evangelist to confirm what he says out of the Old Testament, for the sake of those Jews who believed on Christ, that they might recognize as fulfilled in the grace of the Gospel, the things that were foretold in the Old Testament; therefore he adds, “Now all this was done.”
Here we must enquire why he should say “all this was done,” when above he has only related the conception. It should be known that he says this to shew, that in the presence of God “all this was done” before it was done among men. Or he says, “all” this was done, because he is relating past events; for when he wrote, it was all done.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).