Christ also acknowledged that he had not come to destroy "the law and the prophets" -- but to "fulfill" them, and we should remember that he could not have "fulfilled" them if he had not first taught the true meaning of "the law and the prophets" to that "last generation" of unfaithful Jews in Israel.
"Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil. For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled" (Matt. 5:17-18).
Further, the apostle Paul confirmed that Christ's Old Testament ministry, as recorded in MMLJ/BC, was a record of his work as a "minister of the circumcision" -- a minister of God to "circumcised" Israel to confirm (fulfill) the covenant "promises" made unto the fathers of Israel.
"Now I say that Jesus Christ was a minister of the circumcision for the truth of God, to confirm the promises made unto the fathers" (Rom. 15:8).
Because many people do not know when the Old Testament scripturally "ended" and the New Testament "begins," they mistakenly think of John and Jesus as New Testament "preachers" or "evangelists" sent to "all nations" of the world. However, when in fact the Bible presents them in MMLJ/BC -- as God's final Old Testament "prophets" sent only to Israel. We must recognize the following distinctions that the Scriptures make concerning the "mission" and "work" of Jesus in Old Testament Israel.
1) Before the cross, Christ was God's "promised" old covenant Messiah or prophet with God's final message to Israel; after the cross, Christ was "raised" from the death to become Savior of all alien sinners of "all nations" of the world.
2) After his ascension into heaven, Jesus became God's prophet, priest and king of the New Testament "age."
3) After his coronation and assuming his new covenant "throne" in heaven, Jesus sent his new covenant "apostles" forth into "all the world" with the inspiration of the Holy Spirit to reveal "all truth" of the new covenant as "evangelists" to a lost and dying alien world (Jn. 16:13; Mk. 16:15-16 Eph. 1:17-23).
In studying the "full" and "complete" New Testament of Christ as revealed by the apostles in Acts 2 through Revelation 22, they reveal that the "mission" and "work" of John and Jesus in Israel (MMLJ/BC) was to "prepare" Old Testament Israel for the "end" of their old covenant "kingdom" and the "coming" of the new covenant and "kingdom." However, their "mission" and "work" in MMLJ/BC did not "prepare" those old covenant Israelites with an "automatic" entrance into the new covenant "church" without "faith in" and "obedience to" the New Testament "gospel" and the “new birth” baptism into the death, burial and resurrection of Christ.