he said, "Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil." fulfilling the prophesy of the coming of the new covenant is not condoning under the new covenant what was done in the old. it is only not condemning it. he did not come to condemn what was done in the past but to give salvation to the future. that is the doctrine. he was trying to walk a line so the people he was speaking to wouldn't kill him for blasphemy then and there.