You worship that which you don't know. We worship that which we know; for salvation is from the Jews.
Salvation is of the Jews - They have the true religion and the true form of worship; and the Messiah, who will bring salvation, is to proceed from them. See Luke 2:30; Luke 3:6. Jesus thus affirms that the Jews had the true form of the worship of God. At the same time he was sensible how much they had corrupted it, and on various occasions reproved them for it.