Albert Barnes Commentary John 19:37

"And again another scripture saith, They shall look on him whom they pierced." — John 19:37 (ASV)

Another scripture, Zechariah 12:10. We must here be struck with the wonderful providence of God, that so many scriptures were fulfilled in his death. All these things happened without any such design by the men engaged in these scenes; but whatever was done by Jew or Gentile tended to the fulfillment of prophecies long recorded, and with which the Jews themselves should have been familiar.

Little did they suppose—when delivering him to Pilate; when he was mocked; when they parted his garments; when they pierced him—that they were fulfilling ancient predictions. But in this way, God had so ordered it that the firmest foundation should be laid for the belief that he was the true Messiah, and that the designs of wicked men should all be overruled to the fulfillment of the great plans God had in sending his Son.